Chau and Lena are standing on a riverbank, 110 meters apart, at points A and B respectively. (See the figure below.) Lena is 180 meters from a house located across the river at point C. Suppose that angle A (angle BAC) is 54°. What is the measure of angle B (angle ABC)? Round your answer to the nearest tenth of a degree.

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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.