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 ...
Since we know these angles are both equal, you can find their value by halving 130°. Angles on a straight line also add up to 180°. If a straight line has been split into three separate angles ...
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