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A quadrilateral has vertices in the order (0,1)(0, -1), (2,3)(-2, 3), (6,7)(6, 7) and (8,3)(8, 3). The quadrilateral is a:

Solution

Correct Option: 4

Slopes: AB =2= -2, BC =12= \frac{1}{2}, CD =2= -2, DA =12= \frac{1}{2}. Opposite sides are parallel and adjacent sides are perpendicular (product of slopes =1= -1).

Sides: AB =20= \sqrt{20}, BC =80= \sqrt{80}, so adjacent sides differ. It has four right angles but unequal adjacent sides, hence a rectangle.

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