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Is a parallelogram always a rectangle?

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In some cases the definition does not explicitly include the fact that it is, firstly, a parallelogram. Instead, the definition might specify that there are four sides and all interior angle are right angles. But, whatever the definition is, from it immediately follows that any rectangle is a parallelogram. read more

parallelogram is a quadrilateral in which both pairs of opposite sides are parallel and congruent. Congruent sides are the same length. A rectangle is a parallelogram with 4 right angles. A parallelogram is not always a rectangle. read more

A parallelogram with all 4 interior angles congruent to each other is called a rectangle. So, straight from a definition we see that any rectangle is a parallelogram with additional property of having all interior angle congruent to each other. read more

A parallelogram is a flexible rectangle that can have any combination of angles (generally 2 duplicate pairs of degrees, 360 degrees if flat). A rectangle is an inflexible parallelogram with 4 duplicate degrees. The rectangle and parallelogram can be of any size. read more

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