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2 cards from this section. Quick, good the night before a test.
Find the height of a 20 m long rope making a 30° angle with the ground.
Use the sine function.
If the angle of elevation of a tower is 30° and the distance is 30 m, find the height.
Apply the tangent function.
What is the height of a pole if a rope of 20 m makes a 30° angle with the ground?
Remember the sine function.
Is the angle of depression used to calculate heights looking up only?
Think about perspective.
A 75 m high lighthouse observes two ships at angles of depression of 30° and 45°. What is the distance between the ships?
Use separate calculations for each angle and find differences.
A man at the top of a tower sees a car approaching at first at 30° and then at 60° after 6 seconds. What is the time taken to reach?
Relate speed and distance to compute time.
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