Question

find the circumference of a circle whose area is 16 times the area of the circle with diameter 7 cm​

Answer 1

Diameter= 7cm ,

radius = 3.5 cm.

Area of circle-1 = Area of circle-2 × 16

πr² = πr²×16

r² = 3.5 × 3.5 × 16

r = √(3.5 × 3.5 × 16)

r = 4× 3.5

r= 14 cm

circumstance = πr²

= (22/7)×14×14

= 22×2×14

= 44×14

= 596 cm