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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