If a kite is flying at a height of meters from the level ground, attached to a string inclined at 60° to the horizontal, then the length of the string is 1. 80 m 2. m 3. m 4. 120 m.

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A ladder 14 m long rests against a wall. If the foot of ladder is 7 m from the wall, then the angle of elevation is
15°
30°
45°
60°