Answer:
See below
Explanation:
Angle a cos = adj leg / hyp
arcos(28/35) = a = 36.9 °
angle b you could just say
a + 90 + b = 180° (angles in triangle sum to 180 )
36.9 + 90 + b = 180 b = 53.1°
or angle b = arcsin (opp/hyp) = arcsin (28/35) = 53.1°
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