Rate of dive of a submarine A surface ship is moving (horizon-tally) in a straight line at 10 km/hr. At the same time, an enemysubmarine maintains a position directly below the ship while div-ing at an angle that is 20° below the horizontal. How fast is thesubmarine’s altitude decreasing?

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Ratios

A ratio is a comparison between two numbers of the same kind. It represents how many times one number contains another. It also represents how small or large one number is compared to the other.

Trigonometric Ratios

Trigonometric ratios give values of trigonometric functions. It always deals with triangles that have one angle measuring 90 degrees. These triangles are right-angled. We take the ratio of sides of these triangles.