3. The two angles measuring (30° - a) and ( 125° - 2a)
are supplementary to each other. Find the value of a.
.
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Answer:
30 - a + 125 - 2a = 180
155 - 3a = 180
-3a = 180 - 155
-3a = 25
-a=25/3
a = - 25/3
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