A person is remodeling the front entrance to his home and needs to cut an arch for the top of an entranceway. The arch needs to be 30 ft wide and 5 ft high. To draw the​ arch, he will use a stretched string with chalk attached at an end as a compass.
​a) Using a coordinate​ system, locate the center of the circle.
​b) What radius should the person use to draw the​ arch?
​a) The center of the circle is ____