Supplement.
180o - 128o
= 52o
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128 degrees.An angle's supplement, when added to the original angle, will form a straight (180 degree) angle.
Supplementary angles add up to 180° . The supplement of 128° is therefore 180 - 128 = 52°
An obtuse angle
Find the measure of the angle T, if the measure of the angle T is 20 more than four times its supplement. The supplement of T = (180-T) Write an equation for the statement: "angle T is 20 more than four times its supplement." T = 4(180-T) + 20 T = 720 - 4T + 20 T + 4T = 720 + 20 5t = 740 T = T = 148 degrees Check solution in original equation: 148 = 4(180-148) + 20 148 = 4(32) + 20 148 = 128 + 20
A 128 degree angle would be an "obtuse" angle. This is because the angle measurement exceeds 90 degrees. Anything below 90 degrees would be considered an "acute" angle.