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Geometry - Construct - An altitude of a triangle

Geometry - Construct - An altitude of a triangleУ вашего броузера проблема в совместимости с HTML5
How to use a compass and a straightedge to construct an altitude of a triangle. Once the altitude is constructed we verify that the angle created by the altitude is a right angle. A triangle has 3 altitudes. In this video we will create a single altitude.
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