Remeber that in a right-angled triangle, the side opposite the right angle is the hypotenuse, the side opposite the given angle (or θ) is the called the opposite, and the remaining side is named the adjacent.
There are three trigonometric ratios you can use to find missing angles and sides, and the abbreviation is SOH CAH TOA. This just means that sine is paired with the opposite and the hypotenuse, cosine with the adjacent and the hypotenuse, and tangent with the opposite and the adjacent. You can search this up later to see how each aspect relates to the other in each trio.
The side X is the adjacent side of the triangle and you are given the opposite side as well, which measures 6 units. So if you have OA, the trigonometric ratio you are going to use is cosine as the group is TOA. Now, use the information to solve for X:
tan61=6/X
X=6/tan61
X=3.3ft (to the nearest 10th of a foot)
