T H E E L E M E N T S |
Book I Proposition 5 | |
Then, since AF is equal to AG and AB to AC, the two sides FA, AC are equal to the two sides GA, AB, respectively, and the angle FAG is shared in common; therefore the base FC is equal to the base GB, the triangle AFC is equal to the triangle AGB, and the remaining angles will be equal to the remaining angles respectively, those the equal legs subtend, angle ACF to angle ABG and angle AFC to angle AGB. [I.4] |
||
Previous Page Return to Propositions Next Page |