Question

if two angales of a triangle are 30° and 105° then the third angle will bE

Answer 1

the sum of all angles of a triangle should be 180
therefore 30 degree + 105degree + 'x'= 180
  x = 180- (105+30)
  x = 180-135
  x = 45 degree

Answer 2

If two angles of triangle are 30°and 105°
then by using angle sum property angle 1+angle2 +angle3=180°
30°+105°+angle3 =180°
135°+angle3=180°
angle3=180°-135°
=45°