Geometry Formulas

Area, volume, and surface area formulas for circles, triangles, rectangles, spheres, cylinders, and more.

Calculate the area of a circle using A = πr². Learn how to find the area from the radius or diameter with step-by-step examples.

Calculate the area of a parallelogram using A = bh (base times height). Simple formula with step-by-step examples.

Calculate the area of a rectangle using A = l × w (length times width). Simple formula with practical examples.

Calculate the area of a trapezoid using A = ½(a + b)h. Find the area from two parallel sides and the height with examples.

Calculate the area of a triangle using A = ½bh (half base times height). Step-by-step examples for any triangle.

Calculate the area of an ellipse using A = πab. Learn how to find the area from the semi-major and semi-minor axes.

Calculate the circumference of a circle using C = 2πr or C = πd. Find the distance around any circle with step-by-step examples.

Calculate the surface area of a sphere using SA = 4πr². Find the outer surface area of balls, globes, and spherical objects.

Calculate the volume of a cone using V = (1/3)πr²h. A cone holds exactly one-third the volume of a cylinder with the same base and height.

Calculate the volume of a cylinder using V = πr²h. Find how much a cylindrical container holds with worked examples.

Calculate the volume of a pyramid using V = (1/3)Bh. Works for any pyramid shape — square, rectangular, or triangular base.

Calculate the volume of a sphere using V = (4/3)πr³. Find how much space a ball or globe occupies with step-by-step examples.