In the picture below, the straight lines at A and B are tangents to the'circle with centre O.C is a point on the circle. The angle AO B is 138° and the distance OA is 10cm. A B Suppose the line AC passes through O, find the distance BC correct to 2 decimal places. You may find helpful finding the angle ZACB first. Answer:

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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.