+0  
 
0
266
1
avatar+176 

https://vle.mathswatch.co.uk/images/questions/question1203.png

 Nov 4, 2017
 #1
avatar+629 
+1

The answer to a is pi * x

 

Use this formula to solve the second one, this will help you learn. 

 Nov 4, 2017

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