Two fourths of anything add up to half of it.
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Radius of a circle= Perimeter of the circle/2*pi Radius is half the diameter Radius is the length of a straight line from the center point of the circle to the edge of the circle.
John Stith Pemberton
Half the diameter of a circle is called its radius.
If the half circle is on its flat side, the radius is its height. If the straight part of the half-circle is vertical, the radius is its width.