Prove this mathematically.... Q. Given that : i 1 = r 2 a n d r 1 = i 2 then prove that ABE is parallel to FCD. Share with your friends Share 2 Sanjay Upadhyay answered this Dear studentGiven that i1=r2 and r1=i2Refer the figure shown in figure,Now we can illustrate from i1=r2 that the interior angles are equal when a line BC crosses the two lines AE and FD. Hence the two lines ABE is parallel to FCD.Regards 0 View Full Answer Simran answered this Alternate angles are equal so these lines are parallel -1 Trishu answered this Which two angles are equal ? 0 Yachna answered this Because alternate interior angles are equal. So it is a parallel 0