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lebar = 3y
keliling = 48
keliling = 2(p+l)
48 = 2(5y+3y)
48 = 2(8y)
48 = 16y
48/16 = y
3 = y
panjang = 5y = 5 x 3 = 15 cm
lebar = 3y = 3 x 3 = 9 cm
luas = p xl
luas = 15 x 9
luas = 135 cm²
48 = 2 ( 5x + 3x )
48 = 2 ( 8x )
48 = 16x
x = 3
a) Panjang = 5x = 5 (3) = 15 cm ; Lebar = 3x = 3 (3) = 9 cm
b) Luas = Panjang x Lebar = 15 cm x 9 cm = 135 cm²