The distance of the observer and height of the building form a right angle triangle. Using: tan∅ = height/base We calculate the height of the building: height = 64tan(39) height = 51.8 meters
The second angle is obtained when the height of both the building and tower are used: Height(building + tower) = 64tan(48) 51.8 + tower height = 71.1 tower height = 19.3 meters
This is because, the intercept is the expected mean value of Y when x is equal zero. If x is never zero; that is, no data value is near x equal zero, the regression has little meaning. There is no interest in the regression.