Please help! I think I have the equation set up.

Here, we have to find the value of x

We have given quadrilateral ABCD here , whose angles are as follows

[ The measure of right angled triangle is 90° ]

We know that,

That is

Subsitute the required values

Hence, The value of x is 13 .

Measure of Angle A

Measure of Angle D

Now, we know that,

That is,

Hence, Proved.

in geometry, parallel lines are lines in a plane which do not meet; that is, two lines in a plane that do not intersect or touch each other at any point are said to be parallel. by extension, a line and a plane, or two planes, in three-dimensional euclidean space that do not share a point are said to be parallel.