the radius of the circle is reduced from 5cm to 4cm then the % change of area .	Choose the correct answer
A) 36 %	B) 37 %	C) 35 %	D) 38 %	E) 39 %

Rationale: for 5 cm - > pi * r ^ 2 - - > 3.14 * 5 ^ 2 - > 78.539 for 4 cm - > pi * r ^ 2 - - > 3.14 * 4 ^ 2 - > 50.265 % change - > ( 1 - 50.265 / 78.539 ) * 100 = 36 ie 36 % answer : a
Answer: A