Maths-
General
Easy

Question

In the given figure A B parallel to C D and 'O' is a point such that triangle A B O equals 40 to the power of ring operator end exponent text  and  end text open floor C D O to the power of 0 end exponent equals 30 to the power of ring operator end exponent. closeFind the measure of stack B O D with _ below

  1. 60°    
  2. 70°    
  3. 80°    
  4. 90°    

hintHint:

alternate angles are equal

The correct answer is: 70°


    d r a w space a space i m a g i n a r y space l i n e space M N space parallel to space A B space a n d space p a s s e s space t h r o u g h space O
angle N O D space equals space angle O D C space equals 30 degree space space left parenthesis a l t e r n a t e space a n g l e right parenthesis
angle N O B equals angle O B A space equals 40 degree space left parenthesis a l t e r n a t e space a n g l e s right parenthesis
angle N O D space plus angle N O B space equals angle B O D
angle B O D space equals 40 degree plus 30 degree space equals 70 degree

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