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 ...
Polygons can be regular or irregular in shape. A polygon is a closed 2D shape with at least three sides. A regular polygon is a polygon with all equal sides and angles. An irregular polygon is a ...
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