Question

two angles of triangle are thirty and eighty degree finds the third angle

Answer 1

given - angle 1 is 30
. angle 2 is 80

to find - angle 3

solution-
sum of all angles of triangles is 180

so angles 1+2+3=180
30+80+x=180
110+x=180
x=180-110=70

hence angle 3 is of 70 degree
i hope it will help you

Answer 2

Let the third angle be X.

80°+30°+X= 180°
110°+X= 180°
X= 180°-110°
X= 70°