The area of a circle whose radius is the diagonal of a square whose area is 4 sq. units is :
A. 16π sq. units
B. 4π sq. units
C. 6π sq. units
D. 8π sq. units
Answer: Option D
Solution(By Examveda Team)
Area of square = 4 sq.unitsSide of square = $$\sqrt 4 $$ = 2 units
Diagonal of square = $$2\sqrt 2 $$ units
Radius of the circle = $$2\sqrt 2 $$ units
Radius of the circle :
$$\eqalign{ & = \pi {r^2} \cr & = \pi \times {\left( {2\sqrt 2 } \right)^2} \cr & = 8\pi \,\text{sq. units} \cr} $$
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The percentage increase in the area of a rectangle, if each of its sides is increased by 20% is:
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