Find the missing angle! Please add an explanation!

Answer:
The answer is: [tex]58^\circ[/tex]
Step-by-step explanation:
If we add the angles inside a triangle, we must have [tex]180^\circ[/tex]. So we have an [tex]57^\circ[/tex] angle and an [tex]65^\circ[/tex] angle, their sum is [tex]122^\circ[/tex], so the missing angle must be [tex]180^\circ-122^\circ=58^\circ[/tex]