The first one is correct: angles AGF and FGD form the angle AGD, which is 180°.
By definition, if two angles form a 180° angle, they are supplementary.
For this reason, the supplementary angle to an angle of 65 degrees measures
degrees.
Explanation:
1)
the supplementary angle for <AGF is <FGD so you are correct .
2)
supplementary angles completes each other to 180°
so to find the second angle measurement subtract 65 from 180 the answer would be 115
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degrees.