225 ft A building that is 225 feet tall casts a shadow of various lengths as the day goes by. An angle of elevation 0 is formed by lines from the top and bottom of the building to the tip of the shadow, as seen in the figure above. de -when x = 155. Find the rate of change of the angle of elevation- dæ 0'(155) radians per foot. Round to five decimal places.

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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.