Pi times the radius of the circle squared = area
And diameter is simply the radius x 2, since the radius is half the length of the circle.
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To find area of a circle using diameter, you use this formuler. Area=pi(diameter/2)(diameter/2)
3.1416 times. This figure is normally known as pi.
Yes, it is. Hint, always remember to check that the figure given in the problem is the radius., and not the diameter. If it is the diameter, then the radius is half that.
The radius is half of the diameter of a circle.
Perimeter of what? A circle diameter times Pi. Another shape the sum of all sides.