| Quantitative Aptitude Important Formulas Logical ReasoningGeneral Knowledge of MPGeneral Knowledge of India |
Height & Distance - Important Formulas,Tricks and Examples | ||||||||||||||||||||||||
In a right.angled DOAB, where ÐBOA = q, i)sin q = Perpendicular/Hypotenuse = AB/OB; ii)cos q = Base/Hypotenuse = OA/OB; iii)tan q = Perpendicular/Base = AB/OA = sin q/cos q; iv)cosec q = 1/sin q = OB/AB; v)sec q = 1/cos q = OB/OA; vi)cot q = 1/tan q = OA/AB = cos q/sin q. Trigonometrical identities: i)sin2q + cos2q = 1. ii)1+tan2q = sec2q iii)1+cot2q = cosec2q Values of T-ratios:-
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 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. | ||||||||||||||||||||||||