Circle area = pi*r 2
r= D/2
Circle area = pi*(D/2) 2
= (pi/4)*D 2
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The area of a circle, in terms of pie, with a diameter of 36 is: about 324pi
To find the diameter of a circle, you will either need to know the area or its circumference. If you know the area: diameter = 2 x squareroot(area / Pi) If you know the circumference diameter = circumference / Pi
c/4(3.14)
A circle with a radius of 6 units has an area of 113.1 square units.
The area of a circle with a diameter of two cm is about 3.1416 cm.