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2(p + l) = Keliling
2(20+l+l) = 160
2(20+2l) = 160
40 + 4l = 160
4l = 160 - 40
4l = 120
l = 120/4
l = 30 cm
substitusikan nilai l=30
p= 20 +l
p= 20 +30
p= 50 cm