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A pair of adjacent angles whose non-common sides are opposite rays are called a linear pair. The measure of a straight angle is 180 degrees, so a linear pair of angles must add up to 180 degrees.
Linear pair
Opposite Rays - are collinear rays having the same endpoint.
Oh honey, an angle formed by opposite rays is a straight angle. It's like a perfectly straight line, no curves or funny business. So if you see those opposite rays coming together, you better believe they're forming a straight angle, no ifs, ands, or buts about it.
opposite rays have common end points