Lesson 1, Topic 1
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Trigonometric Ratios: Tangent, Sine and Cosine Ratios

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A trigonometric ratio is a ratio of the lengths of two sides of a right-angled triangle. The three trigonometric ratios are:

1. Sine (Sin)
2. Cosine (Cos)
3. Tangent (Tan)

A right-angled triangle may be labeled as shown below

Hypotenuse

The longest side is called the hypotenuse. It is the side opposite the right angle

Opposite: This is the side opposite the angle under consideration.

Adjacent: It is the side next or adjacent to the angle you are using.

AC is the adjacent side to angle θ

Tangent of an Angle

In any right-angled triangle, the ratio $$\frac {opposite}{adjacent}$$  is called the tangent

Tan θ  = $$\frac {OPP}{ADJ}$$

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