Euclid's Elements: Book 1, Prop 21
A step by step board presentation of Book 1, Proposition 21: "If on one of the sides of a triangle, from its extremities, there be constructed two straight lines meeting within the triangle, the straight lines so constructed will be less than the remaining two sides of the triangle, but will contain a greater angle."
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Euclid's Elements Book 1: Proposition 21
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