Maths-
General
Easy

Question

‘0’ is the centre of the circle and angle B A C plus angle B O C equals 120 to the power of ring operator end exponent then angle C O B equals

 

  1. 300    
  2. 800    
  3. 600    
  4. 1200    

The correct answer is: 600


    In the figure we are asked to find ∠COB
    angle B O C equals 2 angle B A C comma space t h e space a n g l e space f o r m e d space a t space t h e space c e n t r e space i s space t w i c e space t h e space a n g l e space f o r m e d space a t space t h e space c i r c u m f e r e n c e.
space T h e r e f o r e comma space angle B O C equals 2 n space angle O C B equals m space
S i n c e comma space O B space equals space O C space equals space r a d i u s space o f space t h e space c i r c l e space equals space m
space T h u s comma space i n space capital delta space O B C comma space space angle O C B plus angle O B C plus angle B O C equals 180
space space 2 m plus 2 n equals 180 space rightwards double arrow m plus n equals 90

    Therefore the correct option is choice 3

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