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P = ( 3x - 4 )l = ( x + 2 )
K = 2 × ( p + l )
K = 2 × ( 3x - 4 + x + 2)
K = 2 × ( 4x - 2 )
K = 8x - 4
K = 8x - 4
60 = 8x - 4
8x = 60 + 4
8x = 64
x = 8
panjang = ( 3x - 4 ) = 3•8 - 4 = 20 cm
lebar = ( x + 2 ) = 8 + 2 = 10 cm
L = (x+2)cm
A. Keliling persegi = 2(p+l)
K = 2 (3x-4)+(x+2)
K = 6x - 8 + 2x + 4
K= 6x+2x - 8 + 4
K= 8x-12
B. 60 = 8x-12
60+12 = 8x
72 = 8x→ x = 72:8 = 9
Jadi panjang = (3x-4) = 3x9 - 4 = 27-4
Pjg =23cm
Jadi lebar = (x+2)= 9+2 = 11cm