Question

Area of a circle is 49 times the area of another
circle with radius 3 cm. Find the radius of the
bigger circle.​

Answer 1

Answer:

21 cm

Step-by-step explanation:

Area of circle = π*radius²

Let the radius of bigger one be 'r'.

Area of both the circles is same.

=> π(r)² = 49 times of π(3cm)²

=> πr² = 49 * π * 9cm²

=> r² = 49 * 9 cm²

=> r² = 441 cm²

=> r = √441cm²

=> r = 21 cm