Name the longest line segment shown in quadrilateral

The longest line segment shown in quadrilateral
Procedure used:
The sum of interior angles of the triangle is
If the measure of one angle of a triangle is greater than the measure of a second angle, than the side opposite to the larger angle is longer than the side opposite to the smaller angle.
Given:
The quadrilateral
Figure
Calculation:
From the given figure
Consider the triangle
Write the equation to calculate the sum of angles of the triangle.
Substitute
Since, the side opposite to the larger angle is longer and the side opposite to the smaller angle is smaller. Then,
The side
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