Question

the opposite angles of a parallelogram are equal proof practicaly

Answer 1

I have attached a image here, do check it that is the proof.

Answer 2

We know that JK ll ML and the transversal JK intersect the two ll Lines

In ∆ JML and LKJ :

angle MJK=angle KLM {alternate interior angle}

angle KJL = angle MLJ {alternate interior angle}

JL =LJ{common side}

thus, the to triangle are congruent by the ASA congruencey of triangles.

since, ∆ JML=LKJ , angle M = angle K