ICSE Class 9 (2024-25) Ch-21 Trigonometrical Ratios 1- 5 kriston Publication Discovery Math Part-1

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Ch-22 Trigonometrical Ratios

It seems like you are referring to Chapter 22, which likely involves trigonometrical ratios in a mathematics or trigonometry context. Trigonometric ratios are mathematical relationships between the angles and sides of triangles. The primary trigonometric ratios are sine (sin), cosine (cos), and tangent (tan), which are defined as follows:

Sine (sin θ): In a right-angled triangle, the sine of an angle is the ratio of the length of the side opposite the angle to the length of the hypotenuse.
sin(θ)=
Hypotenuse
Opposite side
​


Cosine (cos θ): The cosine of an angle is the ratio of the length of the adjacent side to the length of the hypotenuse.

cos
⁡

Adjacent side
Hypotenuse
cos(θ)=
Hypotenuse
Adjacent side
​


Tangent (tan θ): The tangent of an angle is the ratio of the length of the side opposite the angle to the length of the adjacent side.

tan
⁡
Opposite side
Adjacent side
tan(θ)=
Adjacent side
Opposite side
​


These ratios are fundamental in trigonometry and are widely used to solve problems involving triangles and periodic phenomena.

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[SangeetaNegi-sqii]

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