Question

in figure AB=DC and BC=AD Justify your answer ​

Answer 1

Answer:

      ∵ AB is parallel to DC  (AB || DC),   BC is parallel to AD  (BC || AD)

And∵ ABCD is a parallelogram

or you can write

" And  ∵ the parallel (opposite/facing) sides of parallelogram are equal in measure"

      ∴ AB=DC,   BC=AD

Hope this helps, ∵means since and ∴means therefore