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p : l = 3 : 2
p = 3/5 × 120/2
= 36 cm
l = 2/5 × 120/2
= 24 cm
p = 3/3+2 x 120 (kenapa 3 + 2..karena yang diketahui hasil kelling..yakni hasil perjumlahan)
p = 3/5 x 120 = 3 x 24 = 72(untuk dua sisi)..
kalo satu sisi 72/2 = 36
l = 2/3+2 x 120 = 2/5 x 120 = 2 x 24 = 48 (untuk dua sisi)..
kalo satu sisi 48/2 = 24....
smoga mmbntu yaa...