Answer:
70
Step-by-step explanation:
Since this is an isosceles triangle with AB = AC
This means <B = <C
We know the sum of the angles of a triangle = 180
We are looking for <C
<A + <B + <C = 180
40 + <C + <C = 180
Subtracting 40 from each side and combing like terms
40-40 + 2<C = 180-40
2 <C = 140
Divide by 2
2/2 <C = 140/2
<C = 70
