Which angle has the same measure as angle N?
Are you just supposed to eyeball this?
I'm not familiar with the way of describing angles like that, but...
angle N = angle T
since line NM and line KT are parallel. (you can see that because of those small squares, those means 90 degrees...)
I guess Sara in the example wanted to find the width of the river? So its a bit weird asking for the angle?
In addition to "eyeballing" thinking helps!
You have two right triangles so you know the two non-right angles in each triangle must add to 90. Further, it should be clear that angles MLN and KLT are the same. What does that tell you about angles LMN and LTK?
. Since MN, KL, and LM can be measured on the same side of the river, TK can be solved for.