The angles from least to greatest are
Angle C
Angle A
Angle B
The measure of TU is 12
How to order the angles'
As the size (length) of a side in a triangle increases, the angle opposite that side also increases. This is used to order the angles
The length of TU is solved using the concept of Isosceles triangle theorem.
This theorem is that when the base angles are equal the sides are equal.
The angles marked are equal hence TS = TU = 12