In the following diagram bc is parallel to de
what is the measure of x
angles are not necessarily drawn to scale.

Step-by-step explanation:

By definition, the alternate interior angles formed when a transversal intersects two parallel lines, are congruent, which means that their measures are equal.

Notice in the figure attached that the angle 42° and the angle "y" are Alternate Interior Angles. Therefore:

You can identify that the angles "y", "x" and 109° are supplementary angles, which means that their sum is 180°.

Knowing this, you can write the following equation:

Finally, solving for "x", you get that its measure is:

(w – 2.5)(w + 2.5)

(–4v – 9)(–4v + 9)

step-by-step explanation:

12

step-by-step explanation:

a triangle's   full angle is 180 degrees so 180 - 156 = 24. 24/2=12