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# When Was Trigonometry Invented?

Ancient Egyptian and Greek philosophers used an early form of trigonometry that involved calculating chords to obtain the angles of a triangle. This method was effective for Euclidean plane geometry, but the heart of trigonometry, the sine, was developed in India in the sixth century.

Continue ReadingThe first exposition of modern trigonometry was in a series of five books published by the Indian mathematician Vrahamihira. In this work, Vrahamihira relied on an older Babylonian table of chords to develop his own table of sines. This work was adopted by Islamic mathematicians and eventually passed to Europe, where the modern system of notation was developed by Leonhard Euler in the 18th century.

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Q:
## What Is a Sine Rule?

A: The law of sines states that, for any given triangle, the ratio of the length of a side divided by the sine of the opposite angle is equal to the same rati... Full Answer >Filed Under: -
Q:
## Who Invented Trigonometry?

A: The ancient Greeks were the first to develop the conceptual framework of trigonometry. The noted Greek astronomers Hipparchus, Menelaus and Ptolomy contrib... Full Answer >Filed Under: -
Q:
## What Are Some Real-Life Examples of Trigonometry?

A: Trigonometry has applications in a number of scientific fields, ranging from geography and astronomy to engineering and physics. One of the most important ... Full Answer >Filed Under: -
Q:
## What Is Trigonometry Used For?

A: Trigonometry is used in many fields of applied and practical sciences, such as astronomy, geography, physics and engineering. Trigonometry is used in astro... Full Answer >Filed Under: