(2002, 2M)
(a) $1$
(b) $2$
(c) $2 \sqrt{2}$
(d) $4$
Correct Answer: 13.(b)
Solution: (b) The region is clearly square with vertices at the points $(1,0),(0,1),(-1,0)$ and $(0,-1)$.
$\therefore \quad$ Area of square $=\sqrt{2} \times \sqrt{2}=2$ sq units
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