Euclid Book I PROP. XIII. -- THEOREM.
@ Mr. Eric | Friday, Jun 5, 2020 | 1 minute read | Update at Friday, Jun 5, 2020

The adjacent angles (ABC, ABD) which one right lines (AB) standing on another (CD) makes with it are either both right angles, or their sum is equal to two right angles.

The adjacent angles (ABC, ABD) which one right lines (AB) standing on another (CD) makes with it are either both right angles, or their sum is equal to two right angles.

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