Maths-
General
Easy

Question

What value of x will make AOB a straight line

  1. 50    
  2. 20    
  3. 80    
  4. 100    

The correct answer is: 50


    T o space m a k e space A O B thin space s t r a i g h t space l i n e
angle A O C space a n d space angle B O C space h a v e space t o space b e space s u p p l e m e n t a r y space a n g l e s space w h i c h space m e a n s space t h e i r space s u m space m u s t space b e space e q u a l space t o space 180 to the power of ring operator
angle A O C plus angle B O C equals 180 to the power of ring operator
2 x plus 30 to the power of ring operator plus 2 x minus 50 to the power of ring operator equals 180 to the power of ring operator
4 x minus 20 to the power of ring operator equals 180 to the power of ring operator
4 x equals 160 to the power of ring operator
x equals 40 to the power of ring operator

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