T H E E L E M E N T S |
Book I Proposition 13 | |
Then, since
the angles CBE is equal to the two angles CBA, ABE; let the angle EBD be added to each; therefore the angles CBE, EBD are equal to the three angles CBA, ABE, EBD. [C.N.2] Again, since the angle ABD is equal to the two angles ABE, EBD, let the angle CBA be added to each; therefore the angles CBA, ABD are equal to the three angles CBA, ABE, EBD. [C.N.2] . |
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