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360 = (2 x 50 )+ (2l)
360 = 100 + 2l
2l = 360-100 = 260
l = 260/2 = 130 cm
luas = p x l
luas = 50 x 130
luas = 6500 cm2
sisi 1=sisi 3
sisi 1=50 cm sisi 3=50
jadi,50+50=100
=360-100=260:2=130
lebar=130 cm
luas=130x50=6500 cm²