If radius of a circle is diminished by 10% then its area is diminished by	Select
A) 22  B) 19  C) 877  D) 26  E) 271
Explanation:   Let old radius = 10 units.   New radius is diminshed by 10%. So new radius = 90% (10) = 9 units.   Old area = π × r2 = 100π   New area = π × 92 = 81π   Change = 19π/100π ×100 = 19%   Answer: 19
<result>B</result>
If radius of a circle is diminished by 10% then its area is diminished by