The legs of a picnic table form a triangle where AC and BC have the same length. Find the measures of angles x and y so that the top of the table will be parallel to the ground.

I know that the answer to this problem is x=135 degrees, y=45 degrees. I do not understand the formula to use for this type of problem, so anyone that knows how to work this problem please respond.

I know that the answer to this problem is x=135 degrees, y=45 degrees. I do not understand the formula to use for this type of problem, so anyone that knows how to work this problem please respond.