A parallelogram is a quadrilateral in which each of two sets of opposite sides consists of two parallel lines (or for math purists I should say, parallel line segments).
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That's like asking "What makes a Chevy a Ford ?". A Hexagon has six sides. None of them have to be equal or parallel. A parallelogram has four sides. Two of them are equal and parallel, and the other two are also equal and parallel. To take a hexagon and make it a parallelogram, you have to do some serious cutting and welding.
yes a parallelogram is a parallelogram
The main difference between a rectangle and a parallelogram that makes rectangle a special case of the parallelogram is the fact that all the angles of a rectangle are equal to 90 degrees. This is not the case in a parallelogram because the adjacent angles are only supplementary to each other.
18.5
because both lines are paralle so it is a parallelogram