Scholarship Exam Preparation App
Class 8 - (Math )
Mensuration - Area- Triangle, Square, Rectangle, Parallelogram Rhombus Quadrilateral, Circle, Irregular Figure, Shaded Portion Trapezium
If the circumference of a circle is reduced by 10%, by what percentage will its area be reduced?
a :
10%
b :
20%
c :
19%
d :
21%
Explanation :
Radius will decrease by 10% (0.9 times).
New area = (0.9)² = 0.81 times.
Decrease = 1 - 0.81 = 0.19 = 19%.
New area = (0.9)² = 0.81 times.
Decrease = 1 - 0.81 = 0.19 = 19%.