Question

The area of a ring is 16. 94 CM square and the area of the outer circle is 55. 44 CM square .find the perimeter of inner circle

Answer 1

Answer:

22 cm

Step-by-step explanation:

Area of the outer circle is 55.44 cm²

Area of the ring is 16.94 cm²

Find the area of the inner circle:

Area of the inner circle = 55.44 - 16.94 = 38.5 cm²

Find the radius of the inner circle:

Area = πr²

38.5 = (22/7)r²

r² = 12.25

r = √12.25

r = 3.5 cm

Find the perimeter:

Perimeter = 2πr

Perimeter = 2(22/7)(3.5) = 22 cm

Answer: 22 cm