Euclid Book I PROP. XXVII. -- THEOREM.
@ Mr. Eric | Friday, Jun 19, 2020 | 1 minute read | Update at Friday, Jun 19, 2020

If a right line (EF) intersecting two right lines (AB, CD) makes the alternate angles (AEF, EFD) equal to each other, these lines are parallel.

If a right line (EF) intersecting two right lines (AB, CD) makes the alternate angles (AEF, EFD) equal to each other, these lines are parallel.

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