Height and Distance Formulas

1. Trigonometry:
In a right angled Δ OAB, where ∠BOA = θ,
height and distance
2. Trigonometrical Identities:
   i)sin² θ + cos² = 1
   ii)1 + tan² θ = sec² θ
   iii)1 + cot² θ = cosec² θ
3.Values of T-ratios:
height and distance
4. Angle of Elevation:
height and distance
Suppose a man from a point O looks up at 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.
5.Angle of Depression:
height and distance
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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