+0  
 
+1
75
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 Mar 25, 2020
 #1
avatar+154 
+1

I really want to thank you from the bottom of my heart! thanks man.

 Mar 25, 2020
 #3
avatar+111330 
+1

No prob  !!!!

 

cool cool cool

CPhill  Mar 25, 2020
 #2
avatar+111330 
+3

Formula  for arc length

 

Arc length  =  r * (theta in radians)    

 

So we  have that

 

18 . 4   = r  *  (13pi  /18)        multiply both sides by  (18/  [ 13 pi])

 

18.4 *  18 / [13pi ]     =  r  ≈  8.1  inches

 

 

cool cool cool

 Mar 25, 2020
 #4
avatar+724 
0

13pi/18 * 180/pi = 13 * 180 / 18 = 130°        

Arc  L = 18.4 in

r = { [ (360° * 18.4) /130° ] / pi} / 2 indecision

 Mar 25, 2020
edited by Dragan  Mar 25, 2020
 #5
avatar+154 
+1

No it is right on cphill answer 

 Mar 25, 2020

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