In figure if ab | | CD

x=50

y=75
  • 4
x=50 (adjacen angles)
x+y= 125 (sum of two opposite angles of a triangle is equal to its exterior angle)
50 + y= 125
y=125-50
y=75
  • 1
x= 55 [Vertically oppo. angles]
y=75 [by Angle sum property of triangle]
  • 1
X=50 (alternate interior angle)
Y=75 [x+y=125{alternate interior angle}]
So y=125-50
Y=75
  • 1
x=50 (alternate interior angles are same)
y=75 ,by 180- (50-55) where we get 55 because co interior angles are supplementary.
  • 2
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