Aide aux devoirs de géométrie — Solutions étape par étape gratuites

Bloqué sur vos devoirs de géométrie ? Choisissez votre sujet ci-dessous et obtenez des solutions étape par étape, des exemples résolus et un solveur IA qui lit les photos. Sans inscription, sans accès payant.

GeoCalc Pro is built for high-school and college geometry homework. Find the calculator that matches your textbook problem, plug in the values, and copy the worked solution — including formulas, substitutions, and intermediate steps. For diagrams that don't fit a standard tool, upload a photo to the AI Solver.

Homework Help by Topic

Triangle Homework

Find missing sides/angles, prove congruence or similarity, apply Pythagoras, Heron, Law of Sines/Cosines.

Area & Perimeter Homework

Compute area, perimeter, or both for any 2D shape. Includes composite figures with subtraction.

Volume & Surface Area Homework

For 3D shapes — cubes, prisms, spheres, cylinders, cones, pyramids. Word problems welcome.

Coordinate Geometry Homework

Distance, midpoint, slope, section formula — all the analytic geometry essentials.

Polygon Angle Homework

Interior angle sum, each interior/exterior angle, finding n from a given sum.

Proof Homework

Two-column proofs for triangle congruence, similarity, parallel-line angle theorems.

Find Value of x Homework

Solve for x in equations involving angle sums, similar triangle ratios, area formulas.

Word Problems & Diagrams

Photo of a textbook problem or a tricky diagram? Let the AI read it and solve step-by-step.

How to Use This for Your Geometry Homework

  1. Find your topic in the grid above and click the closest matching calculator.
  2. Enter the values from your textbook problem. Most calculators accept multiple input combinations (SSS, SAS, ASA for triangles, etc.).
  3. Read every step, not just the final answer. The formula, substitution, simplification, and units are all spelled out — that's what your teacher wants in the work shown.
  4. Cross-check with the formula reference. Use the Geometry Formulas page if you want to verify by hand.
  5. Stuck on a non-standard problem? Use the AI Solver — upload a photo or paste the text.

Sample Homework Problem (Solved)

Problem (typical Grade 10): A rectangular garden has area 84 m² and perimeter 38 m. Find its length and width.

  1. Let length = l, width = w.
  2. Area: l × w = 84 …(1)
  3. Perimeter: 2(l + w) = 38 → l + w = 19 …(2)
  4. From (2): l = 19 − w. Substitute into (1):
  5. (19 − w) × w = 84 → w² − 19w + 84 = 0
  6. Factor: (w − 7)(w − 12) = 0 → w = 7 or w = 12
  7. Answer: length = 12 m, width = 7 m (check: 12 × 7 = 84 ✓, 2(12 + 7) = 38 ✓)

✏️ Use the Rectangle Formula page or paste the problem into the AI Solver to verify.

In-Depth Worked-Example Guides

Homework Help FAQ

Is this site really free for homework?

Yes — every calculator, the AI solver, the formula references, and the worked-example blogs are free. No signup, no daily limits, no "Pro" tier hiding the steps.

Will my teacher accept the work the calculator shows?

Every solver shows the formula, substitution, intermediate arithmetic, and final answer — the same structure your teacher expects in "show your work." Copy the steps, replace any custom variable names from your problem, and you're done.

How do I solve a word problem?

Read the problem twice. Identify what's given and what's asked. Translate the situation into the matching geometric formula (area, perimeter, angle sum, …). Then plug numbers into the corresponding calculator. If the wording is tricky, paste it into the AI Solver and the model will identify the geometry.

Can I get help with a photo of my homework?

Yes. Use the AI Geometry Solver and upload a photo. It reads diagrams, identifies labeled angles and sides, and returns the step-by-step solution.

I want to learn, not just copy. Where do I start?

Start with the worked-example blog posts above — they explain why each formula works, not just what. Then try a calculator and check your hand-work against its output.