Posted by **Jenny** on Thursday, September 10, 2009 at 10:12pm.

Find the circumference of a circle whose diameter is 2xR=4.2 ft. Use Pi = 3.14, and round the result to the nearest tenth.

would this be 3.14*2*4.2ft?

- Geometry -
**Quidditch**, Thursday, September 10, 2009 at 10:21pm
This is a little tricky.

Let R = the radius

Let Pi = 3.14 as stated.

The circumference is (Pi)(2)(R)

The problem already calculates (2)(R) for you as 4.2 ft.

So,

circumference = (Pi)(4.2)

or

=(3.14)(4.2) ft.

Multiply and round as requested by the problem.

- Geometry -
**Jenny**, Thursday, September 10, 2009 at 10:22pm
No wonder I kept getting a weird answer thank you for clarifying for me...

- Geometry -
**Quidditch**, Thursday, September 10, 2009 at 10:24pm
Your welcome!

Glad to help.

- Geometry -
**Jenny**, Thursday, September 10, 2009 at 10:24pm
(3.14)(4.2)=13.188

would I round that to 13.19?

- Geometry -
**Quidditch**, Thursday, September 10, 2009 at 10:27pm
No, the problem requests to the nearest tenth which would be:

13.2 ft.

Also, don't forget the units.

- Geometry -
**Jenny**, Thursday, September 10, 2009 at 10:29pm
ok thank you u r a lifesaver

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