Cathy uses the equation sin 49 • to find BC. Aleena uses the equation 13 cos 41 to find BC. 13 Who is correct? Why? Is Aleena wrong? What is the measure of angle B? Explain your reasoning. A 49 13 y C B

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A:

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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.