Three students are trying to find the diameter of circle C. Gregory believes the diameter is equal to the length of chord XY. Maria believes chord WY can be added to create the right triangle WZY. She also thinks the hypotenuse of ΔWZY has a length equal to the radius of the circle.

Jordan believes segment WZ lies on the diameter of the circle, and that if the diameter is drawn, he can make an equation relating the pieces of that diameter of the circle to the pieces of .

The student with the correct approach to finding the diameter is . The diameter of the circle is units.