Question

there are two concentric circles the circumference of outer circle is 132cm and circumference of the inner circle is 88cm find the difference between radii(R-r)

Answer 1

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Answer 2

The difference between the outer circle and the inner circle (R-r) = 7 cm.

• The circumference of outer circle is given as 132 cm.
• Finding the radius of the outer circle,

2πR = 132

R = 21 cm

• Now circumference of inner circle is given as 88 cm.
• Finding the radius of inner circle,

2πr = 88

r = 14 cm

• Now we have to find the difference between the radii
• (R-r) = (21-14) = 7 cm