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Luas / Keliling = 1/2
luas = (2x+4)(x+2) = 2x^2 + 8x + 8
Keliling = 2x +4 + x+2 = 3x + 6
1/2 = (2x^2 + 8x + 8) / (3x + 6)
3x + 6 = 4x^2 + 16x + 16
4x^2 + 13x + 10 = 0
(4x + 5)(x+2) = 0
x = -5/4 atau -2
lebar (x = -5/4) = 2 - 5/4 = 3/4
lebar (x = -2) = 2-2 = 0 (TIDAK MUNGKIN)
panjang = 2 (3/4) = 3/2
ukuran persegi panjang adalah
p = 3/2
l = 3/4