For this case, the first thing to do is to observe that the figure is symmetrical with respect to the FH axis.
Therefore, the following lengths are the same:

So, by equalizing both sides we have:

From here, we clear the value of m.
We have then:


Answer:
The value of m is given by:

Answer:
When two lines are cut by a transversal, the pairs of angles on either side of the transversal and inside the two lines are called the alternate interior angles . If two parallel lines are cut by a transversal, then the alternate interior angles formed are congruent
Answer: 2x+3y = -6
Good luck !