Sum of angles

The sum of angles in a triangle is always 180 degrees.

Since we know that the angles of the triangle add up to 180 degrees, we can work out what x is:

$90\textdegree+49\textdegree+x=180\textdegree$
$\therefore x=180\textdegree-90\textdegree-49\textdegree$
$\therefore x=41\textdegree$

“So angles in a triangle always add up to 180 degrees?” Mandy asked.

“Yep,” Jamie responded.

“Always???” Mandy wanted to confirm.

“Always,” Jamie said, “just like your never-ending love of me <3”