In the triangle ABC, AB is equal to 13, BC = 10, and the middle line ad on the side of BC = 12. Is the triangle ABC an isosceles triangle

In the triangle ABC, AB is equal to 13, BC = 10, and the middle line ad on the side of BC = 12. Is the triangle ABC an isosceles triangle

Because ad is the middle line of BC side
So BD = 1 / 2BC = 5
AB=13,AD=12
You can see that
AB²=AD²+BD²
So ad ⊥ BC
And because BD = CD, ad is the common edge
So triangle abd is congruent with triangle ACD
So AB = AC
The triangle ABC is an isosceles triangle