Question

Two angles of a triangle are 30 degrees and 80 degree, what is the third angle?​

Answer 1

$\large\tt\purple{Hence,\:third\:angle\:is\:70°}$...

For solution see attachment...

Answer 2

Answer:

A=30°. B=80°. C=?.

Let X be the C angle.

A+B+C=180°. (Because sum of angles of triangle is 180°).

30°+80°+X=180°.

110°+X=180°.

X=180°-110°.

X=70°=C.

This is your answer.