In the triangle ABC, ad is the middle line on the side of BC, AB is equal to 6, ad is equal to 5, AC is equal to 8 It's urgent!

The middle line on the hypotenuse of a right triangle is equal to half of the hypotenuse;
Let BC be 10, then ad is half of BC, and 6,8,10 conform to Pythagorean string theorem;
Then the angle BAC is a right angle;

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