Geometry solver for area, perimeter & volume
Pick a shape, pick what you want to find, and enter the measurements — SolveStep shows the formula, substitutes your numbers, and works out the answer one step at a time.
Part of SolveStep's free math solver, alongside dedicated tools for algebra, statistics, matrices, and calculus.
Shapes, formulas, and volumes
Geometry is mostly a matter of picking the right formula and substituting carefully. This tool keeps both parts visible: the formula stays on screen, then each substitution and arithmetic step is shown in order, the same way you'd write it out by hand.
It covers flat shapes (circles, rectangles, squares, triangles, trapezoids, sectors) and solids (spheres, cylinders, cones) — including Heron's formula when you only know three side lengths, and the Pythagorean theorem for right triangles.
Try the algebra solver tooCircles & polygons
A = πr², A = ½bh
Area, perimeter, and circumference for circles, rectangles, squares, triangles, and trapezoids.
Right triangles
a² + b² = c²
Enter any two sides — leave the unknown one at 0 — and find the missing side.
Heron's formula
A = √(s(s−a)(s−b)(s−c))
Find a triangle's area from three side lengths alone, no height required.
Solids
V = (4/3)πr³
Volume and surface area for spheres, cylinders, and cones.
Frequently asked questions
What shapes does the geometry solver cover?
Circles, rectangles, squares, triangles (base-height and three-side/Heron's formula), right triangles via the Pythagorean theorem, trapezoids, circle sectors, spheres, cylinders, and cones.
Can it find a missing side of a right triangle?
Yes. Enter the two legs to find the hypotenuse, or the hypotenuse plus one leg to find the other leg — leave the unknown side as 0.
Does it show the formula, or just the number?
Every result includes the formula used, the substitution with your numbers, and the arithmetic that leads to the final answer.
Is this the same engine as the algebra solver?
No — geometry problems use fixed formulas rather than free-text parsing, so this tool uses a dedicated formula engine with a shape/measurement form instead of a typed equation.
Is this a math solver geometry students can use for homework?
Yes — pick a shape, enter the measurements you have, and it returns the formula, the substitution, and the final answer, which is enough to check homework or learn the method.