T H E E L E M E N T S |
Book I Proposition 21 | |
Therefore if on BC, one of the sides of the triangle ABC, from its extremities B, C, the two straight lines BD, DC are constructed meeting within the triangle; BD, DC are less than the remaining two sides of the triangle BA, AC, but contain an angle BDC greater than the angle BAC. Being what it was required to prove. |
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