8th Grade · Geometry
Volume
8.G.C.9
Definition
The amount of three-dimensional space a solid occupies, measured in cubic units. Cylinders, cones, and spheres each have their own volume formula involving pi.
Teach it
Where it is taught, with guided notes, practice, homework, an exit ticket and an interactive Teacher Deck.
Examples
- Cylinder: V = πr2h.
- Cone: V = (1/3)πr2h. Sphere: V = (4/3)πr3.
Key rule
Cylinder, cone, and sphere all use pi and the radius, but the cone has 1/3 and the sphere uses r cubed.
Memory hook
Space inside a solid, measured in cubic units.