From a Point on the Floor the Angle of Elevation

Short Answer

From a point on the floor the angle of elevation to the top of a door is 48º, while the angle of elevation to the ceiling above the door is 62º. If the ceiling is 12 feet above the floor, what is the vertical dimension of the door (see the figure)? Apply the rules regarding the use of significant digits when determining your answer. Vertical dimension of door = __________ ft