# Maths formulas for class 10 chapter- Introduction to Trigonometry

## 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

### 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

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