Q:

From the peak of a hill which is 300m high, the angle of depression of two sides of a bridge lying on a ground are 45° and 30° (both ends of the bridge are on the same side of the hill). Then the length of the bridge is 

• 1
  300√3 m
• 2
  $${300\over√3}m $$
• 3
  300(√3-1) m
• 4
  300(√3+1) m