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panjang = (x + 6) cm
keliling = 2(p+l)
60 = 2(x + 6 + x)
60 = 2(2x + 6)
60 = 4x + 12
60 - 12 = 4x
48 = 4x
x = 48/4
x = 12
panjang = x + 6 = 12 + 6 = 18 cm
lebar = x = 12 cm
luas = panjang x lebar
luas = 18 cm x 12 cm
luas = 216 cm²
60 - 12 = 48
48 / 4 = 12
panjang = 12 + 6 = 18 cm
lebar = 12 cm
luas = 12 * 18
= 216 cm^