These two angles total 180o therefore they are each others supplements.
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Suppose the angle is x then its supplement is 180 - x so 180 - x = x - 78 that is, 258 = 2x or x = 258/2 = 129 <><><><><> Angle + Supplement = 180 Angle = Supplement + 78 Solve for the system of equations... Angle + Supplement = 180 Angle - Supplement = 78 ------------------------------------- 2 Angle = 258 Angle = 129 Supplement = 51
An angle whose measure is 78 degrees!
90-78 = 12 degrees
90 - 12 = 78 is the complement180 - 12 = 168 is the supplement
It is an acute angle because it's greater than 0 but less than 90 degrees