how to measure opposite angles in parallogram with protector. please show with example

Answer :

We know from properties of parallelogram , Opposite angles are equal in shapes .

So we can verify that with the help of protractor , As  :

Here

$\angle$ A  =  $\angle$ C
And
$\angle$ B  =  $\angle$ D

So, first we measure $\angle$ A  , Let say $\angle$  A  =  70$°$

And the to measure opposite angle , we place our protector as we shown in figure , now we can see that

$\angle$ A  =  $\angle$ C  =  70$°$

Same procedure for $\angle$ B and $\angle$ D