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If you took the three angles of a triangle and glued them on a piece of paper side by side the outer sides would make a straight line. A triangles three angles add up equal 180 degrees. A straight angle,line, equals 180 degrees.
The sum of the measures of angles on a straight line is 180 degrees. Therefore, if angle is equal to 71 degrees, the other is equal to 180 - 71 = 109 degrees.
straight line indicates 180o
a straight line or supplementary angles...which equal to 180 degrees.
A straight line in angles represents 180 degrees.