Question

Find unknown angle with work

Answer 1

110 is on a straight line therefore subtract it from 180 you will get the inner angles

ACB=180-110
ACB=70

ACB=ABC
(both sides are congruent)

we know that total of all the angle in a triangle is 180
so

ACB+ABC+BAC=180
70+70+b=180
140+b=180
b=180-140
b=40

b is 40 :)

Answer 2

40°

Explanation:

At point C, the angle is shown as 110°.
Since a line is 180°, you now know that the other side of point C is 70°.
Line A-B and A-C are equal (shown by the short lines), meaning the angle at point B is also 70°,
A triangle is 180° in total, so the equation would be 180° - 2(70°) = 180° - 140° = 40°