ThePrismSolutions

ThePrismSolutions

HEIGHTS AND DISTANCES

1.We already know that:

In a rt.angled ΔAOBwhere ∠BOA = θ

i) sinθ=Perpendicular/Hypotenuse

ii) cosθ=Base/Hypotenuse

iii) tanθ=Perpendicular/Base

iv)cosecθ=1/sinθ

v)secθ=1/cosθ

vi)cotθ=1/tanθ

2. Trigonometrical identities

i) sin2θ+ cos2θ = 1

ii) 1+tan2θ = sec2θ

iii) 1+cot2θ = cosec2θ

3. Angle of Elevation:

Suppose a man from a point O looks up an object P, placed above the level of his eye. Then, the angle which the line of sight makes with the horizontal through O, is called the angle of elevation of P as seen from O.

Angle of elevation of P from O = ∠AOP.

4. Angle of Depression:

Suppose a man from a point O looks down at an object P, placed below the level of his eye, then the angle which the line of sight makes with the horizontal through O, is called the angle of depression of P as seen from O.


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