Question

- find the
cived of ring between two concentric
and 55
circles
whose circumferences
are
75 cm
cm
​

Answer 1

Step-by-step explanation:

Solution:

Area of ring = A(larger circle) - A(smaller circle)

∴Areaofring=πr12−πr22=π(r12−r22)

∴2πr1=75

∴r1=752π

∴2πr2=55

∴r2=552π

Areaofring=π(r12−r22)

=π((752π)2−(552π)2)

=206.9