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Radius = r = 21 cm

We know the formula to find the Circumference of the circle

That is C = 2 x π x r

Now we can plug the value in this formula, then we can write

Circumference of the circle=C = 2 x π x r

From this we can write

C = 2 x π x r = 2 x 22/7 x 21 = 132 cubic cm.

Diameter = d = 28 cm

Radius =diameter/2 = 14 cm

We know the formula to find the Circumference of the circle

That is C = 2 x π x r

Now we can plug the value in this formula, then we can write

Circumference of the circle=C = 2 x π x r

From this we can write

C = 2 x π x r = 2 x 22/7 x 14 = 4 x 22 = 88 cubic cm.