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54 = 2 (2x + x)
54 = 2 (3x)
54 = 6x
6x = 54
x = 54 : 6 = 9
Berarti, panjang = 2 x 9 = 18 cm
lebar = 9 cm
L = p x l
= 18 x 9
= 162 cm²
54 = 2(2x + x)
54 = 4x + 2x
54 = 6x
= x
9 = x
⇔ L = p × l
= 2x · x
= 2 · 9 × 9
= 18 × 9
= 162 cm²
jadi, luasnya adl 162 cm²