In other words, if two angles add up to form a right angle they known as. Two angles are Supplementary when they add up to 180 degrees (a Straight Angle). These angles share these properties, making them unique angles and important ones to learn when working with applications and problems involving angles and algebra. Two angles are called complementary angles if the sum of their measure equals 90. So, 'supplementary' means 'something when supplied to complete a thing'. Supplementary angles and complementary angles are defined with respect to the addition of two angles. The word 'supplementary' comes from two Latin words 'Supplere' and 'Plere' where 'Supplere' means 'supply, whereas 'Plere' means 'fill'.
These two angles are called supplements of each other. But also note that even if two angles are. When two supplementary angles are joined together, they form a straight line and a straight angle. Congruent supplementary angles are angles that meet two conditions - they are congruent and they are supplementary. Supplementary angles refer to the pair of angles that always sum up to 180. The supplementary angles do not have to be on the same line, they can be on different lines, but should measure 180° In a supplementary angle if one angle is 90°, then the other angle will also be 90°.
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