Trigonometry

principle · 150 BC · Ancient world

The relations between angles and sides (Hipparchus).

Where it is used

• Triangulation — is used in. Calculating triangles.
• Sextant — is used in. Navigational calculations.
• Jacob’s staff — is used in. The altitude of a celestial body is found from an angle.
• Davis quadrant — is used in. The Sun’s altitude is found from the angle of a shadow.

History: what it evolved from and what it influenced

• Euclidean geometry — evolved from. A development of geometry.

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