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Rectangles are parallelograms with right angles. This means that all their angles are 90 degrees, their diagonals bisect, and their two pairs of sides are parallel.

Area and Perimeter

The perimeter of a rectangle is $$P=2w + 2l$$

The area of a rectangle is $$A = lw$$ where l is the length and w is the width.

Symmetry

Rectangles have two lines of symmetry. They are:

Special Properties about Rectangles

A rectangle is a cyclic quadrilateral - that is, every one of its points would fit on the edge of a circle. The radius of that circle would be half of a diagonal.

The diagonals are of equal length and bisect at equal angles.

Here's a little quiz about rectangles: (don't look at the article you just read)

Link to solution of third question.

Overall, rectangles are pretty interesting shapes!

~ Abigale Kim (a+bi)