The first fact we need to review is the definition of a straight angle. A straight angle is just a straight line which is where it gets its name. Supplementary Angles Supplementary Angles Coordinate Geometry Angles Two Angles are Supplementary when they add up to 180 degrees. . The measures of the angles are. Muxakara and 11 more users found this answer helpful. Let x and y represent the supplementary angles and let yx. To mathematically prove that the angles of a triangle will always add up to 180 degrees we need to establish some basic facts about angles. It must be an obtuse triangle because both angles add up to less than 90 and the third angle needs to make the sum of all interior angles 180 degrees 4. Exterior angles of any polygon add up to be how many degrees. The two angles of a linear pair like 1 and 2 in the figure below are always supplementary. C If the measures of two angles add up to 180 deg...
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