Quandaries and Queries
  

 


find the radius of a circle whose area is 1256sq cm.Use pi as an appoximation for pi.
 

 

Hi,

If a circle has radius r then its area is given by

area = r2

Since you have an area of 1256 sq cm you have

1256 = r2 or r2 = 1256/

Take whatever approximation you are using for and calculate  1256/. This gives you r2, so to find r take the square root of 1256/.

Penny

  
 

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