rectangle
a quadrilateral with four right angles
A rectangle is a geometric shape with four straight sides and four right angles, where opposite sides are parallel and congruent (having the same length). The length of a rectangle is typically denoted by the symbol l and the width by the symbol w.
The perimeter of a rectangle is the sum of the lengths of all its sides and can be calculated using the formula P = 2l + 2w. The area of a rectangle is found by multiplying its length by its width and can be calculated using the formula A = lw.
A rectangle is a type of parallelogram with two pairs of parallel sides, but unlike other types of parallelograms, it has the additional property that all of its angles are right angles (i.e., each of its corners is a 90-degree angle).
Examples of everyday objects that are shaped like rectangles include paper, doors, windows, computer screens, and bookshelves.
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