Use a ruler, protractor and a pair of compasses to construct a triangle ... angle at the left-hand endpoint of the given side. Mark the angle and then draw a line from the endpoint through the mark.
It's one of those things most people remember from their school days. The angles in a triangle always add up to 180Ëš. And a right-angled triangle always has one angle that is 90°, so the other two ...
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