A flagstaff is placed on top of a building. The flagstaff and building subtend equal angles at a point on level ground which is 200 m away from the foot of the building. If the height of the flagstaff is 50 m and the height of the building is h, which of the following is true?

• A. 3 - 50h2 + (200)2h + (200)250 = 0
• B. 3 - 50h2 - (200)2h + (200)250 = 0
• C. 3 + 50h2 + (200)2h - (200)250 = 0
• D. one of these