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P = 2L
L = L
keliling = 2(p+l)
54 = 2 ( 2l + l )
54 = 2 ( 3l )
54 = 6L
L = 54/6
L = 9 cm
substitusi L = 9 ke 54 = 2 (p+L )
54 = 2( P + 9 )
54 = 2P + 18
54 - 18 = 2P
36 = 2P
P = 18 cm
Luas = P*L
Luas = 18*9
Luas = 162 cm²