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distance point from a line is half the hypotenuse

Source: 2016 Oral Moscow Geometry Olympiad grades 8-9 p3

July 30, 2019
right triangledistancegeometry

Problem Statement

A circle with center OO passes through the ends of the hypotenuse of a right-angled triangle and intersects its legs at points MM and KK. Prove that the distance from point OO to line MKMK is half the hypotenuse.