AI Geometry Solver
Triangles, circles, prisms and proportions — screenshot the figure and the question, and get the formula, the substitution, and the answer with units.
Try for free- Works on any screenshot — textbook, PDF, or worksheet
- Full step-by-step solutions, not just the final answer
- Free to start — no account needed
- 1The triangle is right-angled, so use .
- 2Substitute: .
- 3Take the positive square root: .
Pick your geometry topic
Each topic page has formulas, worked examples, practice problems, and the mistakes to avoid.
Find the hypotenuse or a missing leg of a right triangle, including the converse and distance problems.
Area and PerimeterEvery plane-shape formula, plus composite figures and working backwards from a known area.
Surface Area and VolumePrisms, cylinders, cones, pyramids and spheres — including reverse problems and slant-height traps.
Similar TrianglesScale factors and proportions, the AA/SSS/SAS tests, and the area ratio that catches people out.
What this geometry solver covers
Geometry is where math stops being purely symbolic and starts describing space. Instead of solving for an unknown number in an equation, you are finding a missing length, an unknown angle, an area, or a volume — usually from a diagram where half the information is written on the picture rather than in the sentence. That diagram dependence is exactly why geometry homework is painful to type into a calculator and easy to screenshot.
This solver covers the standard high-school geometry span: the Pythagorean theorem and its converse for right triangles, area and perimeter for every plane shape including circles, trapezoids and composite figures, surface area and volume for prisms, cylinders, cones, pyramids and spheres, and similar triangles with the proportion and scale-factor reasoning that goes with them.
For each problem it shows the working a teacher expects on paper: which formula applies and why that one, the substitution with the numbers in place, the arithmetic, and the answer with correct units — square units for area, cubic units for volume. Pick a topic below for formulas, worked examples, and practice problems, or install the extension and screenshot the exact figure in front of you.
See it solve real geometry problems
One from each corner of the subject — pick a problem to see its full solution.
- 1The triangle is right-angled, so use .
- 2Substitute: .
- 3Take the positive square root: .
- 1Area of a circle is — square the radius first, then multiply by .
- 2Substitute: .
- 3As a decimal, square units.
- 1Use the trapezoid area formula — the average of the parallel sides times the height.
- 2Substitute: .
- 3 cm². Note the height is the perpendicular distance, not a slanted side.
- 1A cylinder is a circle extruded through a height, so its volume is the circle area times the height.
- 2Substitute: .
- 3 cubic units — cubic, because three lengths were multiplied together.
- 1Similar triangles have proportional corresponding sides, so find the scale factor: .
- 2Multiply the matching side by the same factor: .
- 3Check by proportion: ✓.
Try it on your own geometry homework
Photo Math Solver reads geometry problems straight off your screen — the labelled triangle in a worksheet PDF, the composite shape in an online quiz, the volume question in a photographed textbook — and returns the full step-by-step solution in seconds. It picks the right formula for the figure, shows the substitution, and carries the units through to the answer.
