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B+C = 180 - 50 = 130
B = 2/5 x 130 = 52
C = 3/5 x 130 = 78
50 + 2u + 3u = 180
5u = 180-50
5u = 130
u = 26
maka sudut
b = 2 x 26
= 52
c = 3 x 26
= 78