supplementary angles
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Supplementary angles forms a 180o angle (or a straight line). Complementary angles form a 90o angle.
is called a straight angle
The answer to that is a bisector. The two angles formed by this has the same angle.
A straight angle is a line which has an angle of 180 degrees therefore two right angles (90 degrees) make a line.
Bisected means that it cuts the angle into two equal parts. Therefore, if a 40degree angle is bisected, two 20degree angles will be formed.