Calculate it by multiplying the value of Pi by twice the radius - then multiplying that number by the height... I'll leave YOU to do the maths !
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Formula for the volume of a cylinder... Pi x Radius (squared) x Height !
I am guesing you are talking about a cylinder. if you are it is 1326.65 cm2, assuming that pi is only 2 decimal places or 3.14.
Radius = diameter/2 = 5 cm
That depends what you mean with "a 20 cm. circle". If 20 cm. is the radius, you already have the answer. If 20 cm. is the diameter, the radius is half the diameter. (10cm)
Half the base times the height = 15cm2