Learn this proposition with interactive step-by-step here:
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In proposition 18 of Euclid's Elements, we prove that if one side of a triangle is larger than another side, then the angle opposite the larger side is always greater than the angle opposite the smaller side.
Playlist of Euclid's Elements in link below:
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Clip makes it super easy to turn any public video into a formative assessment activity in your classroom.
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