Question

what is the value of a? a =

Explanation:

Step1: Use the property of congruent angles in a triangle

In a triangle, if two angles are equal, then the sides opposite those angles are equal.

Step2: Identify the sides

Since angles \(T\), \(S\), and \(U\) are equal (assuming it's an equilateral - like property based on angle markings, if angles \(T = S\), then sides opposite them are equal. The side opposite angle \(T\) is \(SU=a\), and the side opposite angle \(U\) is \(TS = 19\).

Answer:

\(a = 19\)