From a distance of 26 meters away, a person notices the sun just disappearing behind the ooftop of a tall building. assume the person is observing from ground level. a) assuming the sun at the time was at an altitude of 68° above the horizon, what is the height of the building? b) a little while later, the same person observes the building's shadow has reached a length of 54 meters. what is the altitude of the sun above the horizon at this time?