Geometry Formulas: Calculators, Proofs & Examples
Solve Formulas is a geometry reference built for homework, class notes, and test prep. Each topic includes a calculator, step-by-step work, and a plain explanation of why the formula works.
Last updated: June 12, 2026
Geometry covers flat shapes (triangles, circles, quadrilaterals), solids (cylinders, spheres, cones), and coordinate geometry on the Cartesian plane. You do not need to memorize every formula at once. Pick the topic you are studying, use the calculator to check your answer, and read the proof when you want the idea to stick.
We are publishing calculators in small batches so every page gets a full write-up, not a thin template. If you are new here, start with coordinate geometry and the distance formula. It is the most common tool on the plane and it connects directly to the Pythagorean theorem.
Start here: distance formula
Find the straight-line distance between two points on a graph. The page includes a calculator, the Pythagorean proof, worked examples, and practice problems.
More topics coming soon
Midpoint, slope, triangle area, circle formulas, and 3D volume tools are in development. They stay off search results until each page is ready. You can still open any live URL from your class notes; we just are not asking Google to index them yet.