Question

A cone has a base radius of 7 centimeters and a height of 21 centimeters.

What is the volume of the cone?

A.
28π cm3

B.
49π cm3

C.
147π cm3

D.
343π cm3
*there is no pic*

Answer 1

V=(1/3)hpir^2
r=7
h=21
V=(1/3)21pi7^2
V=7pi49
V=343pi cm^3

answer is D

Answer 2

V= π·r²·h/3 is the formula to calculate this.

So, V= 3.14 · 7² · 21/3 

Remember to use PEMDAS
 
Exponents are first so:

V= 3.14 · 49 · 21/3

Now division:

V= 3.14 · 49 · 7

Now multiply from left to right:

V= 153.86 · 7

V=  1077.02 

But, in your case, the answer is D) 343π cm³