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54 = 2 (2x + 5 + x - 2)
54 = 2 (3x + 3)
54 = 6x + 6
54 - 6 = 6x
48 = 6x
x = 8
Panjang = 2x + 5 = 21 cm
Lebar = x - 2 = 6 cm
L = p × l
= 21 × 6
= 126 cm²
l = x-2
k = 54
pertama mencari nilai x
k = 2(p+l)
54 = 2(2x+5+x-2)
54 =4x+10+2x-4
54 =6x+6
54-6=6x
48 =6x
x = 8 cm
jadi p = 2.8+5 = 21 cm
l = 8-2 = 6 cm
mencari luas
l = p.l
=21. 6
= 126