Notice that the sides of the quadrilateral are vertical lines and that the top and bottom are horizontal lines. Vertical and a horizontal lines are perpendicular to each other. This means that all of the angles in the polygon are right angles and that the quadrilateral is a rectangle. We can calculate its area using the formula for the area of a rectangle.
A=l w
In this formula, l is the length and w is the width. We can find the measure of the length and width using the Ruler Postulate. Let's start with NP.
