Consider the given circle. Let's add the information about the side lengths.
Now, let's draw a radius in order to have a right triangle. Keep in mind that since the radius is constant, its length is always 13.1.
Finally, we will pay close attention to the right triangle we have just drawn. The length of one of its legs is 6.8 and the leg of the hypotenuse is 13.1. We want to find the length of the other leg, AC.
To find the length of AC we will substitute these values into the Pythagorean Theorem.
