It is the length of the base of the semi-circle.
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The diameter of the semicircle will be twice the radius.
A semicircle is 1/2 of a circle. Find the area with the diameter you are given as if you had a whole circle, then divide that answer by 2 to get the area of the semicircle.
To find the perimeter of the curved section of the semi-circle: Perimeter of semicircle = Pi x radius If you also need to the find the perimeter of the straight part of the semicircle (the diameter), it is simply double the radius.
circumference of a semicircle = pi * diameter / 2 (pi multiplied by the diameter and divided by 2)
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