Answer:
Answer in image
Explanation:
Finding the distance between point A and B, then Point C and B will tell you if the two sides are congruent. Then knowing that two sides are congruent, we can determine whether or not the triangle is isosceles, because isosceles triangles have two congruent sides. Then know there are two congruent sides, we know that the base angles must be the same, which leads to the conclusion of this being an isosceles triangle.
-Hope this helped & Happy New Year!