Question

Difference between the perimeter of two concentric circles is/66 find the difference between /there radius

Answer 1

Answer:

Step-by-step explanation:

2×22/7R-2×22/7r=66

44/7(R-r)=66

R-r=66×7/44

R-r=10.5

Answer 2

Answer:

10.5

Step-by-step explanation:

perimeter of a circle is 2πr

p1 -p2 = 2π (r1-r2)

66 = 2 π (r1-r2)

33/π = r1 - r2

r1 -r2 = 10.5