+0  
 
0
162
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avatar+389 

Please explain how you get the answer

 Mar 5, 2018
 #1
avatar+94558 
+1

Arc length  =      2pi (radius) (x / 360) 

 

Where x is the angle(in degrees) we're looking for

 

So  we have

 

15 pi  =  2pi (60) (x /360)     divide pi out and simplify

 

15  =  2 (60) * x /360      multiply both sides by 360

 

5400  = 120 x     divde both sides by 120

 

45°  =  x

 

 

 

cool cool cool

 Mar 5, 2018

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