The difference between the area and the square ofthe radius of a circl

1.	The difference between the area and the square ofthe radius of a circle is 105 cm2. Find the area ofthe circle.
Answer» Square of radius = r^2 Area of circle = π* r^2 A.T.Q π * r^2- r^2= 105 r^2(π - 1 ) = 105 r^2(22/7 - 7 / 7 ) = 105 r^2(15 / 7 ) = 105 r^2= 49 r = 7 cm Circumference = 2 * π* r = 2 * 22 / 7 * 7 = 44 cm Ans: 44 cm

The difference between the area and the square ofthe radius of a circle is 105 cm2. Find the area ofthe circle.

Answer»

Square of radius = r^2

Area of circle = π* r^2

A.T.Q

π * r^2- r^2= 105

r^2(π - 1 ) = 105

r^2(22/7 - 7 / 7 ) = 105

r^2(15 / 7 ) = 105

r^2= 49

r = 7 cm

Circumference = 2 * π* r = 2 * 22 / 7 * 7 = 44 cm

Ans: 44 cm