By definition, a Right triangle is a triangle that has an angle whose measure is 90 degrees (which is also called "Right angle").
You can identify that the triangle STU is a Right triangle, because:
![\angle U=90\degree](https://img.qammunity.org/2023/formulas/mathematics/high-school/jngl2xmzo96f57kxh1v4xq47b8rfe2d0c2.png)
The following is one of the Trigonometric ratios. It's called "Secant":
![\sec \alpha=(hypotenuse)/(adjacent)](https://img.qammunity.org/2023/formulas/mathematics/high-school/b2iae0h9f3ym25ujzr0hiof5mhzu36uft6.png)
In this case you can identify that:
![\begin{gathered} \alpha=\angle T \\ hypotenuse=TS=37 \\ adjacent=UT=12 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/high-school/fqzczpeljkw90s726vh9tw3jkmexilgpk5.png)
Then, substituting values, you get that the answer is:
![\sec \angle T=(37)/(12)](https://img.qammunity.org/2023/formulas/mathematics/high-school/klnlu4alrwlvv061flamk48x2eah24rcgo.png)