Angles in Parallel Lines: Generate a random angle

Given that the angle
$\alpha$ is a corresponding angle to the angle 120 and is also equal to it, therefore$\alpha=120$

Given that according to the definition, the vertex angles are equal to each other, it can be argued that:

$115=2$Now we can calculate the second pair of vertex angles in the same circle:

$1=3$

Since the sum of a plane angle is 180 degrees, angle 1 and angle 3 are complementary to 180 degrees and equal to 65 degrees.

We now notice that between the parallel lines there are corresponding and equal angles, and they are:

$115=4$

Since angle 4 is opposite to angle 6, it is equal to it and also equal to 65 degrees.

Another pair of alternate angles are angle 1 and angle 5.

We have proven that:$1=3=65$

Therefore, angle 5 is also equal to 65 degrees.

Since angle 7 is opposite to angle 5, it is equal to it and also equal to 115 degrees.

That is:

$115=2=4=6$

$65=1=3=5=7$

Remember the definition of vertically opposite angles:

Vertically opposite angles are formed between two intersecting lines, and they actually have a common vertex and are opposite each other. Vertically opposite angles are equal in size.

Therefore:

$1=2=20$

Let's review the definition of alternate angles between parallel lines:

Alternate angles are angles located on two different sides of the line that intersects two parallels, and that are also not at the same level with respect to the parallel they are adjacent to. Alternate angles have the same value as each other.

Therefore:

$\alpha=40$

According to the definition of alternate angles:

Alternate angles are angles located on two different sides of the line that intersects two parallels, and that are also not on the same level with respect to the parallel to which they are adjacent.

It can be said that:

$\alpha=30$

$\beta=150$

And therefore:

$30+150=180$

The angle 125 and the angle alpha are vertically opposite angles, so they are equal to each other.

$\alpha=125$

$a$is an alternate angle to the angle that equals 30 degrees. That means$\alpha=30$Now we can calculate: $\beta$

As they are adjacent and theredore complementary angles to 180:

$180-30=150$

Angle$\gamma$Is on one side with an angle of 20, which means:

$\gamma=20$

In the question, we can see that there are two pairs of parallel lines, line a and line b.

When passing another line between parallel lines, different angles are formed, which we need to know.

Angles alpha and the given angle of 104 are on different sides of the transversal line, but both are in the interior region between the two parallel lines,

This means they are alternate angles, and alternate angles are equal.

Therefore, 

Angle beta and the second given angle of 81 degrees are both on the same side of the transversal line, but each is in a different position relative to the parallel lines, one in the exterior region and one in the interior. Therefore, we can see that these are corresponding angles, and corresponding angles are equal.

Therefore,

The angle X given to us in the drawing corresponds to an angle that is adjacent to an angle equal to 154 degrees. Therefore, we will mark it with an X.

Now we can calculate:

$x+154=180$

$x=180-154=26$