Geometry Formulas Cheat Sheet
By Dr. Iris Vaughan, Mathematics Editor·Published 15 September 2025·Last reviewed 1 March 2026
Area, perimeter, and volume formulas for every standard shape — triangles, quadrilaterals, circles, prisms, cylinders, cones, and spheres.
Key Formulas
Triangle: A=½bh
Circle: A=πr², C=2πr
Rectangle: A=lw
Cylinder: V=πr²h
Sphere: V=4/3πr³
Cone: V=1/3πr²h
Pythagorean: a²+b²=c²
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