(Find the value of x)

1)90

2)77

3)110

4)30

Step-by-step explanation:

if you can tell its an isosceles triangle by the congruent marks on the two longer legs... then the two lower leg corner have congruent angles... therefor, subtract the sum of the two bottom corners from 180 and there's the top corner

c. side angle side. u shares the same sides