Construct a right triangle with given hypotenuse c such that the median drawn to the hypotenuse is the geometric mean of the two legs of the triangle.
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The conditions of the problem require that However, we notice that twice the area of the triangle is , since and form a right angle. However, twice the area of the triangle is also the product of and the altitude to . Hence the altitude to must have length . Therefore if we construct a circle with diameter and a line parallel to and of distance from , either point of intersection between the line and the circle will provide a suitable third vertex for the triangle. Q.E.D.
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