A carpenter is adding a sun room to the back of a house as shown in the figure. If the width of the room is 15?

A carpenter is adding a sun room to the back of a house as shown in the figure. If the width of the room is 15 feet, the distance from the house to either obtuse corner of the room is 13 feet, and the distance from the house to the point of the room is 18 feet, then = _____o. Round to one decimal place.