If the points ( (k, k-1),(k+2, k+1) ) and ( (k, k+ ) 3) are thr…

If the points ( (k, k-1),(k+2, k+1) ) and ( (k, k+ )
3) are three consecutive vertices of a square, then its area (in square units) is
(a) 2
(b) 4
(c) 8
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