sebidang tanah berbentuk persegi panjang dgn lebar x+2m dn panjang x+7m keliling persegi panjang tersebut 54 cm tentukan a.panjang dn lebar tanah b.luas tanah

L = x + 2 m
P = x + 7 m

K = 2 (p+l)
54 = 2 (x + 2 + x + 7)
54 = 2 (2x+9)
54 = 4x + 18
-4x = 18 - 54
-4x = -36
4x = 36
x = 9

A. P = 9 + 7 = 16 m
L = 9 + 2 = 11 m

B. L = p x l
L = 16 m x 11 m
L = 176 m²

l = x + 2
p = x + 7
k = 2p + 2l
54 = 2(p + l)
54 = 2(x + 2 + x + 7)
54 = 2(2x + 9)
54 = 4x + 18
54 - 18 = 4x
36 = 4x
x = 36/4 = 9
a) p = x + 7 = 9 + 7 = 16m
l = x + 2 = 9 + 2 = 11m
b) L = p × l
L = 16 × 11 = 176m²