Question

A cone has a base radius of 5 centimeters and a height of 18 centimeters.

What is the volume of the cone?

A.
30π cm3

B.
450π cm3

C.
90π cm3

D.
150π cm3

Answer 1

@pooja195

Answer 2

https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=volume%20of%20a%20cone

Answer 3

I got 471.24

Answer 4

\[V=(3.14)(5^2)\frac{ 18 }{3 }\]

Answer 5

Yeah I got 471 again

Answer 6

Oh this doesnt include pi :/

Answer 7

Ohhh then what do I do?

Answer 8

Use the formula for volume:

\(V=\frac{1}{3}\cdot A\cdot h\)

Answer 9

Because the base of the cone is a circle, A (area) is \(\pi \cdot 5^2\).
The height h is 18 cm, so put the numbers in the formula to get the right answer...

Answer 10

Okay one second

Answer 11

My area is 78.5?

Answer 12

How did you do that?

Answer 13

3.14*5^2

Answer 14

Right?

Answer 15

Let's see, we have to calculate the product of: \(\frac{1}{3}\), \(5^2\), \(\pi\) and 18.
It is easy to do \(\frac{1}{3}\cdot 18=6\).
So now I have \(6\cdot 5^2\cdot \pi=6\cdot 25\cdot \pi=150\pi\).

You don't need a calculator, it can be done in the head!

Answer 16

Ohhhhhh

Answer 17

I kept over thinking it

Answer 18

Thanks so much man

Answer 19

Could you help me on another one?

Answer 20

Sorry, have to go.
Tomorrow I rise early to go to work...(it's 11.30 PM here).