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5y x 3y = 240
15y² = 240
y² = 240/15 = 16
y = 4 cm
P : L = 5(4) : 3(4)
= 20 : 12
panjang = 20 cm
lebar = 12 cm
semogamembantu^_^
perbandingan panjang lebar = 5 : 3
L = 240 cm
maka :
L = p x l
240 = 5x x 3x
240 = 15x²
x² = 240/15
x = √16
x = 4
jadi :
panjang = 5 x 4 = 20 cm
lebar = 3 x 4 = 12 cm