Volume of Cylinders, Cones & Spheres

Volume measures the amount of space inside a 3D object. It is measured in cubic units.

42 cm³. I used the formula volume equals length times width times height.

Pi is an irrational number. It is approximately 3.14. It is the ratio between the circumference and the diameter of a circle. It is represented by the symbol π.

A radius is a line from the center of a circle to its edge. A diameter is a line across a circle that passes through the center of the circle.

25π cm² or about 78.5 cm²

V = πr²h. r is the radius of the circular base of the cylinder and h is the height of the cylinder (the distance between the two circular ends).

V = [ggfrac]1/3[/ggfrac]πr²h. r is the radius of the circle at the base and h is the distance between the center point of the circular base and the point at the top of the cone.

V = [ggfrac]4/3[/ggfrac]πr³. If I cut the sphere exactly in half I could see a circle on the face. r is the radius of the circle at the very center of the sphere.

360π cm³ or about 1,130.4 cm³.

The cylinder.