What is the approximate circumference of the circle shown below?

A. 63.4 cm
B. 51.2 cm
C. 25.6 cm
D. 102.4 cm

Question

What is the approximate circumference of the circle shown below? 



 		A.	63.4 cm
 		B.	51.2 cm
 		C.	25.6 cm
 		D.	102.4 cm

ffasinger · Answer

http://media.apexlearning.com/Images/200803/14/cef5924d-77e9-47f9-a7c8-d5df4d0da5ee.gif

aravindg · Answer

Circumference= 2*pi*r

aravindg · Answer

r=d/2 here

ffasinger · Answer

I have no idea?

neonumbrella5115 · Answer

So we can use the formula AravindG gave you to solve the problem.  What value do we know?  We know the d value, or diameter.  The next step will be to divide the diameter by 2 to get the radius, or the distance from the center of the circle to the outline.

ffasinger · Answer

the formula did not work unless i did i did it wrongngng

neonumbrella5115 · Answer

Okay, so the diameter, 16.3, divided by two would give you the radius.  When you plug that into a calculator or do it by hand, what do you get?

ffasinger · Answer

8.15

ffasinger · Answer

@neonumbrella5115

neonumbrella5115 · Answer

Okay, so now we can use the first equation given to you and multiply 8.15 by 2 and then multiply that value and 3.1415.

ffasinger · Answer

51.182

neonumbrella5115 · Answer

Yup!  So now which choice is the answer?

ffasinger · Answer

B

neonumbrella5115 · Answer

You're correct!  Great job!  :)