Use GUESS method for triangles.
G: Givens
We are given a side length of 6 and 17 and a angle between that, whom is 76.
U: Unknowns
We are trying to find the missing side which is opposite of the given angle.
E: Equations,
whenever we have a non right triangle, given two side and a given angle, we can use law of cosines to find the third side.

where a and b are the given sides, and x is the angle measure.
S: Solve
We know plug in the values,


When solving we get

S: Solution
Round if you are needed to,
