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A proof of the triangle proportionality theorem using similarity properties.

A Youtube video from Daniel Thomander

This Youtube video from mathispower4u states and proves the triangle proportionality theorem.

A Youtube video from Jeffrey Bannish

A geometric realization of a proof in H. Wu's "Teaching Geometry According to the Common Core Standards"

Note: This Youtube video from bikes4fish has no audio but is fully annotated.

A Youtube video from LearnZillion

Proving Pythagorean Theorem using similar trianglesGiven Triangle ABC drawn above in the image and prove a^2 + b^2 = c^2 using Simlar Triangles

A Youtube video from Penelope Templeton

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