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Concept 1: Complementary angles
If the sum of two angles is 90˚, these two angles are complementary angles.
Concept 2: Supplementary angles
If the sum of two angles is 180˚, these two angles are supplementary angles.
Concept 3: Angle sum of triangle
The sum of all interior angles of a triangle is 180˚. The abbreviation (reference) is < sum of ∆
Concept 4: Exterior angle of triangle
An exterior angle of a triangle equals the sum of the interior opposite angles f the same triangle. The abbreviation (reference) is ext. < of ∆.
(To use this theorem, you need to make sure the understanding of the ideas of exterior angle and interior opposite angles of a triangle)
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