help!

Question

help!

anonymous · Answer

At a school carnival, the diameter of the mat of a trampoline is 10 feet and the diameter of its metal frame is 12 feet. What is the length, in feet, of the metal frame that surrounds the trampoline? Use 3.14 for π and round your answer to the nearest tenth.

 15.7 feet
 18.9 feet
 31.4 feet
 37.7 feet

anonymous · Answer

@ganeshie8 @jtvatsim

jhannybean · Answer

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anonymous · Answer

okay so i think its asking for the circumference of the metal frame 

do you know the formula for the circumference ?

jhannybean · Answer

If you're trying to find the `length` of the metal frame that surrounds the trampoline, that's simply finding the circumference. 

`circumference = length`

So what is the circumference of the circle?

jhannybean · Answer

Sorry, what is the formula for circumference?*

jtvatsim · Answer

@geny55 Are you more familiar with this formula
$$C = \pi d$$ or this formula for the circumference?
$$C = 2\pi r$$

Mathematically, they are the same, but some people feel more comfortable with one over the other.

anonymous · Answer

do you understand that @geny55 ?

anonymous · Answer

@jtvatsim

anonymous · Answer

whats the answer?