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Some Basic  Concepts

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☼ Some Basic  Concepts  :

I Relation  Between  Angle,  Radius  &  Arc Length  : 

If  \theta c  is  the angle  made  by  an  arc  of   length   ( l )   ( where, l  =  length of arc AB )  at the center of  a circle of  radius  r,  then  \theta  = \frac{l}{r}.

II Trigonometric  Ratios  :  

sin \theta = \frac{\mathrm{Opp.}}{\mathrm{Hyp.}}  =  \frac{\mathrm{PM}}{\mathrm{AP}};  cos\theta = \frac{\mathrm{Base}}{\mathrm{Hyp.}} = \frac{\mathrm{AM}}{\mathrm{AP}};

tan\theta = \frac{\mathrm{Opp.}}{\mathrm{Base}} = \frac{\mathrm{PM}}{\mathrm{AM}};

 

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