Question

The circumferences of two circles are 66cm and 132cm respectively. Find the difference between their radii​

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Answer 1

Answer:

answer is 10.5 cm

Step-by-step explanation:

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Answer 2

Answer:

$\large\boxed{\sf{10.5\:cm}}$

Step-by-step explanation:

For the first Circle, 2πr = 66 cm

=> r = 66/2π

=> r = 33/π

For the second Circle, 2πR = 132 cm

=> R = 132/2π

=> R = 66/π

Therefore, difference in radii is,

=>R - r = 66/π - 33/π

=> R - r = 33/π

=> R - r = 33 × 7/22

=> R - r = 7 × 1.5

=> R - r = 10.5 cm