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70+ Geometry
Calculators

Every geometry topic covered — free, AI-powered, step-by-step solutions.

70+ Calculators
15 Topics
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Pick the right tool for your problem — 2D shapes, 3D solids, proofs, or composite figures.

Shape Calculator
2D & 3D shape solver — area, perimeter, volume
3D Shape Calculator
Volume & surface area for every solid
Geometric Proofs Calculator
Two-column proofs with AI reasoning
Composite Figure Calculator
Compound shapes — area, perimeter, holes
Showing all 70 calculators

Triangle Calculators

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Triangle Solver
Free triangle perimeter & area formula calculator. Solve any triangle (SSS, SAS,
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Right Isosceles Triangle Calculator
Right isosceles (45-45-90) triangle formula calculator — legs, hypotenuse, area,
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Congruent Triangle Calculator
Determine triangle congruence using SSS, SAS, ASA, AAS, or HL. Free step-by-step
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Similar Triangles Calculator
Similar triangles formula calculator — find scale factor and missing sides. Uses
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Triangle Congruence Postulate Calculator
Identify which congruence postulate (SSS, SAS, ASA, AAS, HL) applies to two tria
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Right Triangle Congruence Calculator
Verify right triangle congruence using HL (Hypotenuse-Leg), HA, LA, or LL theore
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3D Pythagorean Theorem Calculator
Calculate the 3D space diagonal of a rectangular prism using the 3D Pythagorean
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Parallel Lines and Triangles Calculator
Find missing side lengths and angles when parallel lines cut through triangles u
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Quadrilateral Calculators

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Quadrilateral Angle Calculator
Find the missing angle of any quadrilateral. Enter 3 angles to calculate the 4th
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Inscribed Quadrilateral Calculator
Calculate properties of a cyclic quadrilateral (inscribed in a circle). Find opp
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Cyclic Quadrilateral Calculator
Calculate area and angles of a cyclic quadrilateral using Brahmagupta's formula.
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Quadrilateral Shape Calculator
Quadrilateral area & perimeter formula calculator — square, rectangle, rhombus,
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Quadrilateral with Points Calculator
Find area, perimeter, and diagonals of a quadrilateral from 4 coordinate points.
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Proving Quadrilateral is Parallelogram
Prove whether a quadrilateral is a parallelogram using 5 different methods: oppo
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Parallelogram Congruence Calculator
Free parallelogram congruence calculator: prove two parallelograms congruent (or
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Parallelogram Calculators

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Parallelogram Angle Solver
Find all angles of a parallelogram from one angle. Consecutive angles are supple
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Parallelogram Height Calculator
Parallelogram area & height formula calculator (A = b·h). Find height from area
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Parallelogram Sides Calculator
Find the sides of a parallelogram from diagonals and angles, or from perimeter.
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Parallelogram with Points Calculator
Calculate area, perimeter, and diagonals of a parallelogram defined by 4 coordin
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Parallelogram Theorem Calculator
Apply and verify parallelogram theorems: opposite sides, angles, diagonals bisec
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Rhombus Parallelogram Calculator
Calculate area, perimeter, and diagonals of a rhombus. All sides are equal in a
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Trapezoid Calculators

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Trapezoid Angle Calculator
Find angles of a trapezoid. Co-interior angles along each leg sum to 180°.
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Isosceles Trapezoid Calculator
Calculate area, perimeter, diagonals, and angles of an isosceles trapezoid.
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Trapezoid Midsegment Calculator
Calculate the midsegment (median) of a trapezoid. The midsegment equals the aver
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Right Trapezoid Calculator
Calculate area, perimeter, and angles of a right trapezoid (one right angle).
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Trapezoid Calculator
Trapezoid area & perimeter formula calculator: A = ½(b₁+b₂)h. Find missing heigh
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Circle Calculators

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Circle Geometry Calculator
Free circle area & perimeter formula calculator (A = πr², C = 2πr). Enter radius
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Circle Analytic Geometry Calculator
Find the equation of a circle from center and radius, or from 3 points on the ci
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Inscribed Circle Calculator
Calculate the radius of a circle inscribed in a triangle (incircle).
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Polygon Calculators

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Similar Polygons Calculator
Find the scale factor and missing side lengths of similar polygons.
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Polygon Sides Calculator
Find the number of sides of a polygon from its interior angle sum or each interi
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Polygon Angle Sum Calculator
Polygon interior & exterior angle formula calculator. Interior sum = (n−2)×180°,
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Polygon Coordinates Calculator
Polygon area formula calculator (Shoelace formula). Find area, perimeter, centro
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2D Shapes Calculator
Calculate area and perimeter of any 2D shape: square, rectangle, triangle, circl
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Angle Calculators

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Geometry Angle Calculator
Find supplementary, complementary, and reflex angles. Classify angle types insta
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Angle Addition Postulate Calculator
Apply the Angle Addition Postulate: find a missing angle when two adjacent angle
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Geometry Height Calculator
Find an object height using angle of elevation and distance from the base.
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Parallel Lines & Transversals

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Parallel Lines Transversal Calculator
Find all 8 angles formed when a transversal crosses parallel lines: alternate in
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Parallel Lines Slope Calculator
Find the equation of a line parallel to a given line passing through a point.
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Parallel Lines Cut by Transversal Finder
Identify angle pairs and find missing angles when two parallel lines are cut by
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Parallel Lines and Transversals Calculator
Free parallel lines and transversals calculator: enter one angle, get all 8 angl
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Coordinate Geometry

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Distance and Midpoint Calculator
Distance + midpoint formula calculator. d = √((x₂−x₁)²+(y₂−y₁)²) and M = ((x₁+x₂
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Geometry Slope Calculator
Find the slope of a line through two points, and determine if lines are parallel
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Section Formula Calculator
Section formula calculator (Class 10 coordinate geometry). Find point P dividing
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Geometric Transformations

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Geometric Transformation Calculator
Apply geometric transformations: translation, reflection, rotation, and dilation
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Geometry Dilation Calculator
Find the image of a figure after dilation from a center point with a given scale
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Proofs & Theorems

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Pythagorean Theorem Calculator
Find any side of a right triangle using the Pythagorean theorem. a² + b² = c².
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Triangle Inequality Theorem Calculator
Check if three side lengths can form a valid triangle using the Triangle Inequal
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Exterior Angle Theorem Calculator
Find the exterior angle of a triangle. The exterior angle equals the sum of the
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Vertical Angles Theorem Calculator
Verify and calculate vertical angles. Vertical angles formed by two intersecting
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Isosceles Triangle Theorem Calculator
Apply the Isosceles Triangle Theorem: base angles are equal when two sides are e
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Congruent Triangles with Parallel Lines Calculator
Free congruent triangles with parallel lines calculator: use alternate-interior
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Similar Triangles with Parallel Lines Calculator
Free similar triangles with parallel lines calculator: apply the Basic Proportio
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Geometric Proofs Calculator
Free geometric proofs calculator: paste your given and goal, get a complete two-
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Segment Calculators

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Segment Length Calculator
Calculate the length of a line segment given two endpoint coordinates.
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Segment Bisector Calculator
Find the perpendicular bisector equation of a line segment given its endpoints.
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Solid Geometry

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Cube and Rectangular Prism Calculator
Cube & rectangular prism formula calculator — V = l×w×h, surface area, space dia
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Sphere and Cylinder Calculator
Sphere, cylinder & cone volume + surface area formula calculator. V_cylinder = π
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Advanced & General

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Law of Sines Calculator
Solve any triangle using the Law of Sines. Find sides or angles from AAS, ASA, o
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Law of Cosines Calculator
Solve triangles using the Law of Cosines. Works for SSS and SAS cases where the
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Heron's Formula Calculator
Calculate the area of a triangle from three side lengths using Heron's formula.
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Geometric Mean Calculator
Find the geometric mean of two numbers or apply the geometric mean to altitude a
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Special Right Triangles Calculator
Calculate side lengths of 30-60-90 and 45-45-90 special right triangles from any
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Geometric Sequence Calculator
Geometric sequence formula calculator: nth term aₙ = a·rⁿ⁻¹, partial sum Sₙ = a(
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Composite Figure Calculator
Free composite figure calculator with worked examples: L-shapes, T-shapes, donut
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AI-Powered Tools

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AI Geometry Problem Solver
Describe any geometry problem in words and let AI solve it step by step. Support
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AI Geometry Proof Generator
Generate formal two-column geometry proofs with AI. Input your given information
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AI Geometry Image Solver
Upload a photo of your geometry problem and let AI analyze, identify, and solve
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Geometry Formula Explainer
Get AI-powered explanations for any geometry formula. Understand the why behind
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Geometry Study Guide Generator
Generate a personalized geometry study guide with AI. Enter the topic and get co
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