This topic seems to say that two houses are overlooked from a 25-meter-high tower. The first house is 20 degrees northeast, with a overlooking angle of 28 degrees, and the second house is due east, with a overlooking angle of 17 degrees. How far is the distance between the two houses? How to decorate?

A: The first one is 20 degrees east-northeast and 25tg28 is from the bottom of the tower; The second house is due east, 25tg 17 away from the tower bottom, so the distance between the two houses (by cosine theorem): [(25tg28) 2+(25tg17) 2-2 * 25tg17 * 25tg28 * cos 20].