Find the circumference of a circular disk whose area is 100pi square centimeters.

The area of a circular disk with radius r is given by pi*r^2,
wher pi  is the ratio of the circumference to the diameter of the
circle.

The actual area of the disk is 100pi sq
cm

Therefore pr^2 = 100pi sq
cm

Therefore r ^2 = 100 sq cm. So r = sqrt100 = 10
cm.

So the radius of the disk is 10
cm.

The circumference c of the circular disk is given
by:

c = 2pir.

Therefore c = 2p*10 cm =
20pi.

Therefore the circumference of the disk = 20
pi.