Euclid - Euclid's Elements (300 BC)

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In right-angled triangles the square on the side subtending the right angle is equal to the squares on the sides containing the right angle.

Euclid

That, if a straight line falling on two straight lines make the interior angles on the same side less than two right angles, the two straight lines, if produced indefinitely, meet on that side on which are the angles less than the two right angles.

Euclid