Complementary angles are two angles that add up to 90°, or a right angle; two supplementary angles add up to 180°, or a straight angle. We know that when the measure of an angle is exactly 90°, then it is known as a right angle. Supplementary angles are those angles that measure up to 180 degrees. The classification of a pair of angles is given as: Two angles are said to be supplementary angles when they add up to 180 degrees. 50 degrees and 130 degrees 4. Also touching on what it means to be perpendicular Angles are also formed by the intersection of two planes. 70 degrees and 110 degrees 5. The converse of the Same Side Interior Angles Theorem is also true. Complementary and supplementary angles are the two types of angles based on their measures. Each one of these angles is called the supplementary of the other. Supplementary add upto 180 degrees whereas complementary angles add to 90 degrees. Save. What does supplementary angles mean? An angle is formed when the line segment meets at a point. When two angles add up to 180 degrees they are called Supplementary Angles. Practice: Finding angle measures between intersecting lines. 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