If the radius of a circle is decreased 20%, what happens to the area? Select the correct option.
A) 10% decrease  B) 20% decrease  C) 36% decrease  D) 40% decrease  E) 50% decrease
Area of Square = Pi* radius^2   New Radius = 4/5 * old radius   so new area = (4/5)^2 old area =&gt; 16/25 of old area =&gt; 64% old area   Answer : 36% decrease
<result>C</result>
If the radius of a circle is decreased 20%, what happens to the area?