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<B = <D
<C = 4x
<A+B+C+D = 360o
4x+5x+4x+5x = 360o
18x = 360o
x = 360/18 = 20o
y = 2 1/2x, y = 50o
9x = 180
x = 180/9
x = 20
2y = 5×20
y = 100/2
y = 50
x dan y = 20 dan 50