SolveTap

Free Chrome extension Geometry

Geometry Solver: solve any problem from a picture

SolveTap's Geometry Solver is a free browser extension that reads a screenshot or photo of a geometry problem — including the diagram — and explains the solution step by step, citing the theorem behind every move. It handles proofs, circle theorems, triangles, polygons and coordinate geometry without an account or a fee.

Add Geometry Solver — free See worked examples

Why geometry needs its own solver

Geometry is the one math subject where the question usually isn't in the text — it's in the diagram. A generic math solver that only parses equations misses the tick marks that show two sides are congruent, the square that marks a right angle, or the fact that a point sits on a circle. That context is the problem.

The Geometry Solver is built around that reality. When you capture a problem, it first restates what it sees — the labeled points, the given measurements, the marked relationships — so you can confirm it read the figure correctly. Then it solves the problem the way a tutor would: naming the theorem that justifies each step, not just chaining calculations.

That matters most in proofs, where the answer is the reasoning itself. Instead of a bare "the triangles are congruent," you get the full argument: which sides and angles match, which congruence criterion applies, and why each statement is allowed. You can hand-check every line against your textbook.

What it covers

  • Triangle congruence SSS, SAS, ASA, AAS, HL and proof writing
  • Similarity AA, SAS, SSS similarity and scale factors
  • Circle theorems Inscribed angles, tangents, chords, arcs
  • Angle relationships Parallel lines, transversals, polygons
  • Area & volume 2D figures, prisms, cylinders, cones, spheres
  • Right-triangle trig Pythagorean theorem, sine, cosine, tangent
  • Coordinate geometry Distance, midpoint, slope, circle equations
  • Transformations Reflections, rotations, translations, dilations
  • Constructions Bisectors, perpendiculars and their logic

Step by step, like class expects

Worked examples

These are the kinds of explanations the Geometry Solver produces from a single screenshot.

Proving two triangles congruent

Congruence proof

In triangle ABC, M is the midpoint of BC and AM ⊥ BC. Prove that △ABM ≅ △ACM.

  1. BM ≅ CM. M is the midpoint of BC, and a midpoint divides a segment into two congruent segments (definition of midpoint).
  2. ∠AMB ≅ ∠AMC. AM ⊥ BC, so both angles are right angles, and all right angles are congruent.
  3. AM ≅ AM. A segment is congruent to itself (reflexive property).
  4. △ABM ≅ △ACM by SAS. Two sides and the included angle of one triangle are congruent to the corresponding parts of the other (steps 1–3).

△ABM ≅ △ACM by the SAS congruence postulate — and by CPCTC it follows that AB ≅ AC, so △ABC is isosceles.

Common mistake the solver flags: citing SSA, which is not a valid congruence criterion — the right angle here is included between the two known sides, which is why SAS applies.

Inscribed angle on a circle

Circle theorem

Points A, B and C lie on a circle with center O. The central angle ∠AOB measures 100°, and C lies on the major arc AB. Find ∠ACB.

  1. Identify the arcs. The central angle ∠AOB = 100° intercepts the minor arc AB, so arc AB (minor) = 100°.
  2. Locate the inscribed angle. ∠ACB has its vertex on the major arc and intercepts the same minor arc AB.
  3. Apply the inscribed angle theorem. An inscribed angle measures half its intercepted arc: ∠ACB = 100° ÷ 2.

∠ACB = 50°.

Common mistake the solver flags: if C sat on the minor arc instead, ∠ACB would intercept the major arc (260°) and measure 130° — the diagram decides which arc is intercepted.

Equation of a circle through a point

Coordinate geometry

Write the equation of the circle with center (2, −1) that passes through the point (5, 3).

  1. Recall the standard form. A circle with center (h, k) and radius r is (x − h)² + (y − k)² = r².
  2. Find the radius. r is the distance from the center to the given point: r² = (5 − 2)² + (3 − (−1))² = 3² + 4² = 9 + 16 = 25.
  3. Substitute. With h = 2, k = −1 and r² = 25: (x − 2)² + (y − (−1))² = 25.

(x − 2)² + (y + 1)² = 25 — a circle of radius 5.

Common mistake the solver flags: writing (y − 1)² instead of (y + 1)². Subtracting a negative coordinate flips the sign inside the parentheses.

How it works for geometry

  1. Capture the problem. Screenshot it from a PDF, learning platform or webpage — or photograph the textbook page or your own sketch. Include the whole diagram and any given measurements.
  2. Check the reading. The solver restates the givens it extracted from the figure. If a label or angle mark was misread, tell it and it corrects course before solving.
  3. Follow the reasoning. Every step names its justification — a theorem, postulate or definition — so the solution doubles as a study reference for the next problem of the same type.

Stuck on one particular move? Ask a follow-up like "why does the inscribed angle theorem apply here?" or "show me this proof in two-column form" and the explanation adapts. The goal is that the next circle-theorem problem is one you can do alone. Read more about that approach on our academic integrity page.

Reading a diagram before you solve: a 30-second habit

Whether you use a solver or not, strong geometry students interrogate the figure before touching the question. Four things to extract every time:

  • Marks beat looks. Tick marks, angle arcs and right-angle squares are facts; how the figure is drawn is not. A triangle that looks isosceles isn't, unless something marks it.
  • Name the given relationships. Midpoints, bisectors, parallel marks and tangent points each unlock a specific theorem — write down which one before solving.
  • Hunt for hidden triangles. Most circle and polygon problems are solved by finding the right triangle inside them, often by drawing one extra radius or diagonal.
  • Ask what the answer needs. A proof needs a congruence or similarity criterion; a length usually needs Pythagoras, similar triangles or a circle relationship. Working backwards narrows the search.

The Geometry Solver models exactly this habit in its solutions — which is why reading a few of its explanations closely tends to improve the problems you solve without it.

Geometry questions

Geometry Solver FAQ

Can the Geometry Solver read a hand-drawn diagram?

Yes. Take a clear photo or screenshot of the figure. The solver reads labeled points, marked angles, tick marks and given measurements, then states what it understood before solving, so you can correct it if a label was misread.

Does it write full proofs or just give the final statement?

It writes the full argument: each statement is paired with the theorem, postulate or definition that justifies it, in the same style as a two-column or paragraph proof you would submit in class.

Which geometry topics does it cover?

Triangle congruence and similarity, circle theorems, angle relationships, polygons, area and volume, transformations, trigonometry basics and coordinate geometry, from middle school through introductory college courses.

Is the Geometry Solver really free?

Yes. It installs free from the Chrome Web Store and works without an account or payment card.

What if I don't understand one of the steps?

Ask a follow-up question about that step. The solver can re-explain it more simply, show a different method, or connect it back to the theorem it relies on.

Try it on tonight's geometry homework

Free, no sign-up, and every step explained. Your data is never sold — see the privacy policy.

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