Question

How can you tell the degrees of an angle inside a triangle?

Answer 1

we have that

The sum of the interior angles in any triangle must be equal to 180 degrees

Let

A, B and C the angles in a triangle

If you have

A=30 degrees

B=60 degrees

the angle C is equal to

A+B+C=180

C=180-(A+B)

C=180-(30+60)

C=90 degrees