Luis is in charge of making props for a school play. He needs to make a large circular wooden clock that measures about 6 feet in circumference. Which equation can he use to find r, the radius of the clock?
A. r = 6/pi
B. r= 12/pi
C. r=6/2pi
D. r= 12/2pi

Question

Luis is in charge of making props for a school play. He needs to make a large circular wooden clock that measures about 6 feet in circumference. Which equation can he use to find r, the radius of the clock?
A. r = 6/pi
B. r= 12/pi
C. r=6/2pi
D. r= 12/2pi

anonymous · Answer

What is the equation for the circumference of a circle?

parthkohli · Answer

2 * pi * radius

anonymous · Answer

C= pi times diameter

anonymous · Answer

But what does diameter equal in terms of radius?

parthkohli · Answer

@Romero radius = diameter/2

anonymous · Answer

half of it.

anonymous · Answer

the radius is half the diameter

anonymous · Answer

the formula is, 2pi(r) = C

anonymous · Answer

would the answer be C?

anonymous · Answer

radius = diameter/2 or 2* radius= diameter so lets replace this with the equation of the circumference

C= pi *2* radius

And we know the circumference is 6 so lets replace that

6= pi *2* radius

anonymous · Answer

yes.

anonymous · Answer

If you rearrange to get r isolated then yes the answer will be c

anonymous · Answer

@Hero I got this hero :P

hero · Answer

1. Wriite out the formula for circumference: 
$$C = 2 \pi r$$

2. Input the given value for the circumference, 6 into the formula: 
$$6 = 2 \pi r$$

3. Divide both sides by 2 pi: 
$$\frac{6}{2\pi} = r$$

4. Compute r:

hero · Answer

@Romero , if you really had it, then I wouldn't have to type anything.

anonymous · Answer

, THANKS.

anonymous · Answer

@Hero I dud but you interrupted with the answer. You know that's not allowed right?

anonymous · Answer

So, final answer is C,right?

hero · Answer

I provided steps and explained every step. I didn't do anything wrong.

anonymous · Answer

its C 6/2pi

parthkohli · Answer

Oops, I deleted my answer by mistake :(

anonymous · Answer

ok, thanks, everyone.

anonymous · Answer

@Hero No you can't interrupt someone who is already explaining it. It just confuses the asker.

parthkohli · Answer

@Romero agree

hero · Answer

Romero, I interrupted because your explanations did not seem clear.

hero · Answer

@happyhorse can probably back me up on that.

anonymous · Answer

Yes, hero.

anonymous · Answer

@Hero It wasn't clear because you interrupted

anonymous · Answer

He didnt confuse me at all

parthkohli · Answer

We can calculate by tranposing. Here it is : |dw:1335106278275:dw|