Question

Find the area of a circle which has radius of 21 cm

Answer 1

Answer:

Area of a circle = πr²

r = 21 cm

Area= 3.14×21×21

= 1384cm (app.)

Answer 2

Answer:

Area of cicle = Area of sphere

Area of sphere = 4/3pi r^3

Area of sphere = 4/3 × 22/7 × (21)^3

Area of sphere = 40,316.57 cm^2