Question

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(look in picture and answer quistions in picture)

Answer 1

answer:

the observation is that all angles must be equal to 90 degree.

because according to co interior property sum of two co int. angles is 180 degree.(in a quadrilateral)

and as it is seems to be a parallelogram the two co int. must be equal. So, each one of them is equal to 90 degrees.

hope it helps you:-)