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A=D
D+C = 180
(3y+5) + (y+23) = 180
4y + 28 = 180
4y = 180 - 28
4y = 152
y = 152/4
y = 38
Dit: besar A = 3y+5 = 3(38) + 5 = 114 +5 = 119
maaf kalau salah ya..