Question

The circumference of a circular painting is 53.38 feet. What is the radius of the painting? Use 3.14 for pi and do not round your answer.

Answer 1

Do you know the formula for circumference?

Answer 2

pi times diameter

Answer 3

Hmm exactly :D

Answer 4

Or you could say 2 times radius times pi

Answer 5

2 times radius is same as diameter :P

Answer 6

8.49... http://www.wolframalpha.com/input/?i=radius+for+circumference+of+53.38

Answer 7

So you can isolate r.

Answer 8

\(\Large \color{MidnightBlue}{\Rightarrow 2 * 3.14 * r = 53.38 }\)

\(\Large \color{MidnightBlue}{\Rightarrow 6.28 * r = 53.38 }\)

\(\Large \color{MidnightBlue}{\Rightarrow r = 8.49569 }\)