Answer:
40°
Explanation:
You want the acute angle in the right triangle with opposite side 19 and adjacent side 23.
Tangent
The tangent relation in a right triangle is ...
Tan = Opposite/Adjacent
Here, that means ...
tan(?) = 19/23
? = arctan(19/23) ≈ 39.5597°
To the nearest degree, the angle is 40°.