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∠A = 3 1/2 penyikunya=7/2 x
7/2 x + x =90
9/2 x = 90
x = 90 : 9/2
x = 90 . 2/9
x= 20
∠A=7/2 x = 7/2 . 20 = 70
pelurus ∠A=180-70=110