The subset of P is R
Meaning of Subset and similarities between a parallelogram and a rectangle
A subset is a set that every element in its is contained in a super set but it doesn't contain all the element in a superset.
A parallelogram is a quadilateral with two pairs of parallel sides. the opposite sides are equal and the opposite angles are equal.
A rectangle is also a quadilateral of four sides where the opposite sides are equal.
A rectangle and a parallelogran are similar.
We can conclude by saying, a parallelogram has all the features of a rectangle but a ractangle doesnt have all the features of a parallelogram. This is what makes R a subset of P
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