### Height and Distance

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__Height & Distance__

Trigonometry Rules

Basic Trigonometric Values

Trigonometric Formulas

**Degrees to Radians and vice versa**

360°= 2π radian

**Trigonometry Quotient Formulas**

* tanθ=sinθ cosθ

* cotθ=cosθ sinθ

**Trigonometry - Reciprocal Formulas**

* cscθ = 1/sinθ

* secθ = 1/cosθ

* cotθ = 1/tanθ

**Trigonometry - Pythagorean Formulas**

* sin

^{2}θ + cos

^{2}θ = 1

* sec

^{2}θ - tan

^{2}θ=1

* csc

^{2}θ - cot

^{2}θ=1

Angle of Elevation

Suppose a man from a point O looks up at an object P, placed above the level of his eye. Then, angle of elevation is the angle between the horizontal and the line from the object to the observer's eye (the line of sight).

i.e., angle of elevation = angle AOP

Angle of Depression

Suppose a man from a point O looks down at an object P, placed below the level of his eye. Then, angle of depression is the angle between the horizontal and the observer's line of sight

i.e., angle of depression = angle AOP

i.e., angle of depression = angle AOP