Answers

2014-06-23T22:13:51+05:30
In the fig, AB is parallel to DC and BC is the transversal
therefore angle B + angle D=180 (Interior pair of angles) ...(i)
similarly AB is parallel to DC and AD is the transversal
therefore angle A + angle D=180 (Interior pair of angles) ...(ii)
therefore from (i) and (ii) B+C=A+D but D=C therfore
B+D=A+D
B=A  that means A=B=C=D
therfore it is a rectangle therefore by property of rectangle
1. AD=BC (opposite side of a rectangle)and
2. AC=BD (diagonals of a rectangle are congruent)
0
sorry there are some mistakes in my ans but i can't edit it