As we can see by the 60 degree mark at angle C, we know this is a 30-60-90 triangle. I have attached an image of the relationship for a 30-60-90 triangle.
Using the example of y = 1, we can see that x the other leg of the triangle would be y
.
So, x is equal to y
, which we got from using the relationship shown in the attached image. The correct answer is the fourth option.
Hope this helps! :)