We know that in a triangle, the interior angle opposite to largest side is largest, opposite to smallest side is smallest and opposite to medium side is medium.
Here, CA < BC < AB
Also, angles A, B and C are opposite angles of the sides BC, CA and AB respectively,
The size of the angle is always corresponding to the opposite side to it, for example ∠A corresponds to side BC ∠C corresponds to side AB ∠B corresponds to side AC thus given x=6 then: AC=x^2-x/2=33 AB=x^2+x/2=39 BC=x^2+x/3=34 thus the order of angles from the smallest to the largest is ∠B, ∠A, ∠C