Question

The circumference of a redwood tree trunk is 20π ft, and it is 100 ft tall. What is the approximate volume of the redwood tree trunk?

1,000π ft3
10,000π ft3
4,000π ft3
40,000π ft3

Answer 1

10,000π ft3

Explanation:

I took the test

Answer 2

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Answer:

(b) 10,000π ft³

Explanation:

The relation between circumference and radius is ...

C = 2πr

r = C/(2π) = (20π)/(2π) = 10 . . . . feet

The volume of a cylinder with radius 10 ft and height 100 ft is ...

V = πr²h

V = π(10 ft)²(100 ft)

V = 10,000π ft³