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.
Scientists can estimate the depth of craters on
the moon by studying the lengths of their shad- ows in the craters. Shadows" lengths can be
estimated by measuring them on photographs.
Find the depth of a crater if the shadow is estimated to be 400 m long and the
elevation of the sun is 48°
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