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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
5Q:
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
- 1300√3 mfalse
- 2$${300\over√3}m $$false
- 3300(√3-1) mtrue
- 4300(√3+1) mfalse
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