Rectangle facts for kids
A rectangle is a shape with four sides and four corners. The corners are all right angles. It follows that the lengths of the pairs of sides opposite each other must be equal.
Tables, boxes, books, and papers look like rectangles.
A rectangle with all four sides equal in length is called a square.
Formulas
If a rectangle has length and width w
Images for kids

A saddle rectangle has 4 nonplanar vertices, alternated from vertices of a cuboid, with a unique minimal surface interior defined as a linear combination of the four vertices, creating a saddle surface. This example shows 4 blue edges of the rectangle, and two green diagonals, all being diagonal of the cuboid rectangular faces.
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Rectangle Facts for Kids. Kiddle Encyclopedia.