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let the two straight lines BD, DC be constructed meeting within the triangle;
I say that
BD, DC are less than the remaining two sides of the triangle BA, AC,
but
contain an angle BDC greater than the angle BAC.
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T H E E L E M E N T S |
Book I Proposition 21 | |
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On BC, one of the sides of the triangle ABC, from its extremities B, C, let the two straight lines BD, DC be constructed meeting within the triangle; I say that BD, DC are less than the remaining two sides of the triangle BA, AC, but contain an angle BDC greater than the angle BAC. |
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