The answer is roughly 1.53658536585366
This value is approximate. Round it however you need to
------------------------------------
Explanation:
RU = 7.7 is the longest side, so it is the hypotenuse. We will not use this as part of the tangent ratio. Recall that tangent is the ratio of the opposite and adjacent sides of the right triangle.
The opposite side of reference angle U is CR = 6.3 since U is nowhere to be found in the letter pair CR. The adjacent side is UC = 4.1 since U is found here.
So,
tan(angle) = opposite/adjacent
tan(U) = CR/UC
tan(U) = 6.3/4.1
tan(U) = 1.53658536585366
This value is approximate. Round it however you need to