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Answer:
U ={ Parallelograms}
A= { Parallelogram with four congruent sides}={ Rhombus,Square}
B ={ Parallelograms with four congruent angles} ={ Rectangle, Square}
So, AB= { Square}
So among all the parallelograms "Square" is the only parallelogram which has all congruent sides as well as all congruent angles.
First let's get rid of the in the denominator of the fraction on the right side of the equation. This will help to get only
and a coefficient on one side of the equation:
Now, simply divide by 730 to find :