Answer:
x = 70°
Step-by-step explanation:
We are given that two of the sides are congruent so that will make the triangle isosceles.
We know also that the base angles of an isosceles triangle are congruent so we know a second angle.
< 1 = 55° ( given)
< 2 = 55° ( isosceles Δs have base <s ≅)
Using the fact that the sum of angles in a triangle is 180° we can find the third angle.
< 3 = 180 -55-55 = 70°
