Not enough information. Distance from where to the circle?
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Its the distance from the center of the circle to the edge of the circle.
Radius is the distance from the outside of the circle to the center. Diameter is the distance ACROSS the circle, it's formula is: D = 2R (Diameter is 2 times the Radius) Circumference is the distance AROUND the circle. C = Pi D, where Pi is the constant 3.1415.... (look it up))
A radius is half of the diameter of a circle, or the distance from one endpoint to the center.
The distance around a circle is its circumference
To find the area of half a circle, use the formula for a circle pi*r^2 divided by 2. pi = 3.14, r = radius (half the distance across the circle)