Three vertices of a rectangle are $(-2, 0), (2, 0)$ and $(2,1)$ .

Find the fourth vertex of this rectangle.

$(-2, 1)$
$(1, 2)$
$(-2, -1)$
$(2, 1)$

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We can use reflection from transformation of geometry. (-2,0) is reflected from (2,0). So, (2,1) can be reflecting to (-2,1).

The answer is (-2,1)