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Math problem in the sixth grade of primary school: there is a triangle in the semicircle, and the area of the triangle is 800 square centimeters. What is the area of a semicircle minus a triangle?
1, and the inner radius of the circle is represented by r, then the area of the triangle can be = 2r×r÷2 = r &；; sup2
The area of the triangle is 800 square centimeters.