# A problem i never got correct

#### Richay

##### New member
There's this problem i've been working on for ages and i still haven't gotten it right lol.

Teh Circumference of a circle is 16 pi inches! Find the radius of the circle and the area of the circle!!!!! Then find the volume of a circular cylinder 5 inches tall that has this circle as its base!!!!!!!!!!!!!!!!!!!!!!

makes no sense!!

#### skeeter

##### Senior Member
$$\displaystyle C = 2\pi r$$

$$\displaystyle 16\pi = 2\pi r$$

so ... what does r = ?

once you find out, substitute it for r in the formula below to find the circle's area.

$$\displaystyle A = \pi r^2$$

#### Richay

##### New member
R = 43.96?

I don't get it. My answer is 276.0688

#### stapel

##### Super Moderator
Staff member
Richay said:
What does this value stand for?

Thank you.

Eliz.

#### Denis

##### Senior Member
Richay said:
There's this problem i've been working on for ages and i still haven't gotten it right lol.
Teh Circumference of a circle is 16 pi inches! Find the radius of the circle and the area of the circle!!!!! Then find the volume of a circular cylinder 5 inches tall that has this circle as its base!!!!!!!!!!!!!!!!!!!!!! makes no sense!!
Reason it makes no sense is evidently because you skipped most
If you cannot solve: 16 pi = 2 pi r
then you need more help than what is available here.

Can you solve this for x?
6a = 3ax

#### ChaoticLlama

##### Junior Member
Code:
^^^^^^^^^^
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/agrees with Denis

#### skeeter

##### Senior Member
Richay said:
R = 43.96?

I don't get it. My answer is 276.0688
let's go back to 3rd grade ...

(16 ) = (2 ) times what whole number?