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lebar = y
y+y+30 = 80
2y = 50
y = 25
maka lebar = 25
dan panjang = 55
p = 30 + l
Ubah p menjadi l
30 + l + l = 80 cm
2l = 50
l = 25 cm
p = 30 + 25 = 55 cm