Answer :
Since it has two sets of parallel sides and two pairs of opposite sides that are congruent, a rectangle has all of the properties of a parallelogram. That's why a rectangle is always a parallelogram. However, a parallelogram is not always a rectangle
Answer:
A parallelogram by definition has 2 pairs of parallel sides.
A parallelogram could be:
____________
| |
|___________|
A rectangle in euclidean geometry has 4 right angles.
For example:
________________
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|_______________|
However, a parallelogram may have 2 pairs parallel sides but not 4 right angles.
For example:
______________
\ \
\______________\
Therefore, A parallelogram is not always a rectangle.
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