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Demostrates how to take any triangle and make it become the medial triangle of a larger triangle. Also explains that the three altitudes of a triangle are concurrent. [10:01]
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altitude of a triangle, informal proof, medial triangle, points of concurrency, prove theorems about triangles, ccss.math, hsg-co.c.10, khan academy, khan academy: triangles: proof: triangle altitudes are concurrent (orthocenter), khan academy: triangles: proof: triangle altitudes are concurrent (orthocenter) hsg-co.c.10, points of concurrency in triangles
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