3. The Greek mathematician Eratostenes (ca. 276-195 B.C.) measured the circumference ofthe earth from the following observations. He noticed that on a certain day the sun shonedirectly down a deep well in Syene (modern Aswan). At the same time in Alexandria, 500miles north (on the same meridian), the rays of the sun shone at the angle of 7.2◦to thezenith. Use this information to find the radius and the circumference of the earth
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.
3. The Greek mathematician Eratostenes (ca. 276-195 B.C.) measured the circumference ofthe earth from the following observations. He noticed that on a certain day the sun shonedirectly down a deep well in Syene (modern Aswan). At the same time in Alexandria, 500miles north (on the same meridian), the rays of the sun shone at the
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