Question

Please help me at least understand?

Answer 1

The sum of the angles is

`(3)/(2)x+(1)/(2)x+x=3x`

The sum of the interior angles of a triangle is 90 degrees or
`\pi` radians. Assuming that these are the "two ways" the exercise is looking for, you can write

`3x=90`

or

`3x=\pi`

depending on whether you're using radians or not.

If you don't think that these are the "two ways" please let me know, and we'll try to figure something else out.