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3x + 5 + x - 3 = 90°
4x + 2 = 90°
b
4x + 2 = 90°
4x = 88°
x = 22°
c.
besar masing masing sudut
sudut 1 = 3x + 5 = 3(22) + 5 = 66 + 5 = 71°
sudut 2 = x - 3 = 22 - 3 = 19°