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Portion of the area of a circle is called a sector.
to find the area of a semi circle measure the length of the straight edge, divide by 2, square it and multiply by pi. This will give you the area of the circle. To get the area of the semi-circle divide your answer by 2
Rewrite the above program so that the program accepts any value for the radius then recalculate the area of the circle.
Radius of circle: 37.68/2pi = 5.996958256 units Area of circle: pi*5.996958256^2 = 112.9826266935 or about 113 square units
Exactly as in the question and a segment of a circle is the area enclosed by a chord and an arc of a circle.