What are the diameter and radius of a circle with a circumference of 28π m?

A.
d = 28 m
r = 14 m

B.
d = 14 m
r = 28 m

C.
d = 14 m
r = 7 m

D.
d = 7 m
r = 14 m

Question

What are the diameter and radius of a circle with a circumference of 28π m?
 
 A.
d = 28 m 
r = 14 m
 
 B.
d = 14 m 
r = 28 m
 
 C.
d = 14 m 
r = 7 m
 
 D.
d = 7 m 
r = 14 m

anonymous · Answer

@iGreen.

anonymous · Answer

$$\pi \div circumfronce$$ That is how I remember you do it

aaronandyson · Answer

The circumference of a circle is C = 2*pi*r In this case, C = 28pi (given)

aaronandyson · Answer

plug that in to get 
C = 2*pi*r 
28pi = 2*pi*r 
now solve for r and tell me what you get

aaronandyson · Answer

Here's how you solve for the radius r 
28pi = 2*pi*r 28pi/pi = 2*pi*r/pi ... Divide both sides by pi. 
28 = 2*r 28/2 = 2r/2 ... Divide both sides by 2.
14 = r 
r = 14

anonymous · Answer

Formula:

$C = 2 \pi d$

Plug in 28pi:

$28 \pi = \pi d$

Dividing pi to both sides gives us:

$28 = d$

So the diameter is 28, to find the radius we divide 28 / 2. And what's that? @torifame

anonymous · Answer

@torifamelol