# It has a triangle equal to 180 degrees and I don’t understand this, can you help me?

##### 2 Answers

#### Answer:

See below.

#### Explanation:

Here we are formulating an equation to solve for

We know that the interior angles of any triangle adds up

We have three angles given:

This means that :

Now we collect like terms to simplify.

Now we solve like any linear equation by isolating the variable on one side of the equation with the constant on the other.

Here we must subtract **both** sides to isolate the

We want one

Here we divide by

We can check if we are right by putting our value of

#### Answer:

Triangle sum theorem states that all angles in a triangle must add up to

#### Explanation:

You have already applied the triangle sum theorem which states that all 3 angles in a triangle add up to

So

The angle