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