If the radius of a circle is decreased 10%, what happens to the area?
Choose the most appropriate option:  A) 10% decrease  B) 19% decrease  C) 36% decrease  D) 40% decrease  E) 50% decrease
Area of Square = Pi* radius^2   New Radius = 0.9 * old radius   so new area = (0.9)^2 old area =&gt; 0.81 of old area =&gt;81% old area   Ans : 19% decrease
<result>B</result>
If the radius of a circle is decreased 10%, what happens to the area?