# Beginning Trigonometry Topics?

Trigonometry started in the Arabic world and took its modern form using ratios for the functions in the 13th century. At first it was just used for triangles, but later Newton, Fourier and others f...
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http://www.ehow.com/info_8507750_beginning-trigonometry-topics.html

## Who is the father of trigonometry?

According to the San Francisco Unified School District, Nasir Al-Din Al-Tusi is considered the father of trigonometry. Al-Tusi lived from 1201 to 1274 AD and was also known as a noted medical schol...
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http://www.answerbag.com/q_view/2094872

## How to Do a Right Triangle in Trigonometry?

In trigonometry, right triangles are those containing a 90-degree angle (right angle). They are the shape the Pythagorean theorem is based on, where the square of the side opposite of the right ang...
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http://www.ehow.com/how_8497219_do-right-triangle-trigonometry.html

## How to Use Right Angled Trigonometry?

This article would benefit from a video. Please add a video to this article, following these guidelines. Remove this notice when the article has been improved. Notice added on {{{date}}}.Right angl...
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http://www.wikihow.com/Use-Right-Angled-Trigonometry

## Relationships In Trigonometry?

Trigonometric functions are functions that relate an angle on a unit circle to its x and y coordinates. Unit circles are circles with radius 1 that are centered at the coordinates (0, 0). All six t...
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http://www.ehow.com/info_8495954_relationships-trigonometry.html