Auxiliary lines - Is an extra line that is added to a diagram to help solve a problem or prove a concept., Corollary - Is a theorem of less importance which can be readily deduced from a previous, more notable statement., Exterior angle of a triangle - Are those angles that are formed outside it., Interior angle of a triangle - An angle inside a shape. The sum of the interior angles of a triangle is always 180 degrees, Remote interior angle - Angles are just the two angles that are inside the triangle and opposite from the exterior angle,

Theorems about triangle angles

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