So this question is basically asking for if you know Geometric proofs.
The equal sign with squiggly marks above it is a congruency statment, meaning that the two figures are the exact same, in size, shape, and measurement.
Because the question states that TU is equal to 13, that means also because "TU"VW is congruent to "AB"CD, we can assume that AB = 13.
Hope this helps!
