To classify a quadrilateral, use the slope of opposite sides to determine if the sides are parallel or perpendicular .
In geometry a quadrilateral is a four-sided polygon, having four edges and four corners. A few examples of quadrilaterals are square, rectangle and trapezium.
A quadrilateral is classified by taking the slopes of its adjacent sides.
If the slopes are parallel, then the sides of the quadrilateral is also parallel.
And is the slope of the sides are perpendicular, then the sides of the quadrilateral are right angle to each other.
Thus, to classify a quadrilateral, use the slope of opposite sides to determine if the sides are parallel or perpendicular .
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