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The radius is 1/2 the diameter. So, since the diameter is 8 the radius of the circle would be 4.
you cant: pi is the same for any circle - 3.1415... the diamter or the radius has to be given diameter divided by two equals the radius the radius times two equals the diameter
Radius = Diameter/2 so if diameter = 20 Radius = 20/2 = 10
The circle's radius is 1.5/2 = 0.75 ft = 9 inches The area of the circle is (pi) times (radius)2 = (pi) x (9)2 = 254.469 square inches (rounded)
The name of half a diameter is a radius.