1.The elevation of the top of a tower is 45degree from each of two points on the ground 200m apart,
one due south and the other due east end of the tower. What is the height of the tower
呢條題目應該講: 有2個人(我當2個人代表2點啦),一個在塔的東面,一個在塔的南面, 2個人望向塔頂都係45度角,而且2點距離係200米