# Maths formulas for class 10 chapter- Introduction to Trigonometry

#### Math Formulas

## Class 10 chapter- Introduction to Trigonometry Formula

**Introduction and Application of Trigonometry**

Definition of Angle If we rotate a line segment with respect to any of its end points, then amount of rotation is called angle. If rotation exists in anti-clock wise direction, angle is said to be positive, otherwise negative.

### Trigonometric ratios for any right angled triangle

sineθ =sinθ, cosineθ = cosθ, tangentθ = tanθ, cosecantθ = cosecθ, secantθ = secθ

Where p→perpendicular, h→ hyptenuse, b→ base

### Trigonometric Identities

### Values of Trigonometric ratios of 0° to 90°

θ |
0 ° |
30 ° |
45 ° |
60 ° |
90 ° |

sin θ° | 0 |
1/2 |
1/√2 |
√3/2 |
1 |

cos θ° | 1 |
√3/2 |
1/√2 |
1/2 |
0 |

tan θ° | 0 |
1/√3 |
1 |
√3 |
Not defined |

**Line of sight** : The line of sight (or line of vision) is the line from our eyes to the object.

**Angle of Elevation** : Angle between horizontal line and line of sight, if the object is above the horizontal level of eyes.

**Angle of Depression** : Angle between horizontal line and line of sight, if the object is below the horizontal level of eyes

Physics Wallah prepared detail **NCERT Solutions** do solve questions given in NCERT text book with the help of **NCERT Solution for class 10 Maths**.

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