There are several of ways to find a radius, it depends on what information you already have. One way is of course to measure from the center of the circle to any point on the edge. Another is to use the formula, radius = square root of area / square root of pi.
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Divide the circumference by 2PI to find the radius. ( C = 2PI*Radius)
you double the radius to find the diameter.
squares do not have a radius
A kite does not have a radius.
You already know the radius.