Trigonometry Terminology

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Geometry & Trigonometry

Right Triangles & Trigonometry

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8 Terms

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Trigonometry

The study of triangles and their angles and side lengths

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Sine

The ratio of the leg opposite the angle to the hypotenuse

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Cosine

The ratio of the leg adjacent to the angle to the hypotenuse

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Tangent

The ratio of the leg opposite the angle to leg adjacent to the angle

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Angle of elevation

Formed by an observer’s sight line and a horizontal line when looking up at something

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Angle of depression

Formed by the observer’s sight line and a horizontal line when looking down at something

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Law of Sines

(sinA/a)=(sinB/b)=(sinC/c)

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Law of Cosines

a²=b²+c²-2bc(cosA)

b²=a²+c²-2ac(cosB)

c²=a²+b²-2ab(cosC)

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