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Question

Find the area of the largest triangle that can be inscribed in a semi-circle of radius r units. [CBSE 2015]

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Solution

Radius of the semi circle r units

When a largest triangle inscribed in a semicircle, then base = r + r = 2r units

Thus, Area of triangle is given by
12×base×height=12×2r×r=r2 square units

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