Question

How do I prove in a 1 paragraph that AXB is the isosceles

Answer 1

As you have to prove if AXB is isosceles you need to know that an isosceles triangle has two sides with the same measure. In this case, You know that X is the midpoint of AB.AC=BC then that fact makes AXB an isosceles triangle because the measure of XA is the same that the measure of XB.