The diameter of the cone is 8 inches, and the height is 12 inches. What is the approximate volume of the cone?
Start by finding the radius, r, of the cone. The radius is equal to
2
1
of the diameter, 8.
8
12
V =
3
1
π r
2
h
The radius of the cone is
inches.
Good work!
You just found that the radius of the cone is 4 inches. Now, substitute for r and h in the formula.
8
12
V =
3
1
π r
2
h
V =
3
1
· π ·
2
·
Excellent!
Now that we’ve substituted 4 for r and 12 for h, we can multiply all of the terms to find the volume of the cone. Find the approximate volume of the cone.
You can solve on paper or use the calculator to solve, then enter your answer on Zearn.
You can use 3.14 as an approximation for π.
8
12
V =
3
1
πr
2
h
V =
3
1
· π · 4
2
· 12
The approximate volume
of the cone is about
in
3
.