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x+y= 4/3
x-y= 2/3
_______ _
2y= 2/3
y= 1/3
x+ 1/3= 4/3
x= 1
1+1/3+4/3= 8/3
besar sudut ketiga = (4/3)/(8/3) x 180= (4/8) x 180= 1/2 x 180= 90