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Where does the interior angle sum theorem come from?
👉 Learn about the interior and the exterior angles of a polygon. A polygon is a plane shape bounded by a finite chain of ...
👉 Learn how to solve for an unknown variable in the exterior angle of a polygon. The exterior angle of a polygon is the ...
It is important to remember other angles rules, such as angles on a straight line add up to 180°, and to recognise angles in parallel lines. Make sure you are confident in applying Pythagoras’ theorem ...
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