I don't like the ones where we have to approximate, but you did say please.
That's a right triangle, relative to x we're give the opposite leg 6.1, and the adjacent leg 5.1, so
tan x = opposite/adjacent = 6.1/5.1
x = arctan (6.1/5.1)
x ≈ 50.1°
Answer: 50.1
We leave out the degree sign because it's not part of x -- it's written separately at L.