A ladder 3.9 m long is placed in a vertical plane which is at right angle to the vertical wall, the foot of the ladder being on horizontal ground. If the food of the ladder is pushed towards the wall at 1.8m/s, at what rate is the top of the ladder ascending the wall when the food is 1.5m from the wall?

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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.