Have you ever wondered how architects determine the amount of material needed to build a pyramid-shaped roof or…
Draw any geometric shape online: triangles, polygons, circles, 3D solids. Compare browser-based tools (GeoGebra, Desmos, paper) and learn…
Solve for x in any geometry problem: angle sums, similar triangles, Pythagoras, area formulas, parallel lines, vertical angles.…
Every 3D solid formula in one place: cube, rectangular prism, cylinder, sphere, cone, pyramid. Volume + surface area…
Master the distance formula d = √((x₂−x₁)²+(y₂−y₁)²) and midpoint M = ((x₁+x₂)/2, (y₁+y₂)/2). Full derivation, worked examples, and…
Polygon angle formulas: interior sum (n−2)×180°, exterior sum 360° always, plus each angle for regular polygons. Worked examples…
Geometric sequence formula aₙ = a·rⁿ⁻¹ vs series Sₙ = a(1−rⁿ)/(1−r). When does the infinite sum converge? Worked…
The complete one-page cheat sheet of geometry formulas: area, perimeter, volume, surface area, angle sums, distance, midpoint, and…
Ten mental shortcuts for geometry: Pythagorean triples, the 30-60-90 and 45-45-90 ratios, square diagonals, the parallel-line angle hack,…
Three methods for polygon area: formulas for regular polygons, decomposition for composites, and the Shoelace Formula for irregular…