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persegi panjang
p : l
3 : 2
y : 12
maka y = 12/2 x 3 = 6 x 3 = 18 cm
keliling persegi panjang
2(p+l)
2(18+12)
2(30)
= 60 cm
k persegi panjang = (27x2)+(12x2)=54+24=78cm