Pick a shape and enter its measurements to get its area, perimeter or volume.
Circle area = πr². Rectangle area = length × width. Cylinder volume = πr²h. Sphere volume = 4⁄3 πr³.
A circle of radius 5 has area π × 25 ≈ 78.54. A cylinder of radius 3 and height 10 holds π × 9 × 10 ≈ 282.74 cubic units.