Area of a Rectangle

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Introduction

A rectangle is a four-sided polygon with two pairs of parallel sides. The angles between each of the sides are all right angles. A square is a type of rectangle that has four sides of the same length.

Terms

Area - A quantity that expresses the extent of a two-dimensional shape.

Square - A polygon with four equal straight sides and four right angles.

Rectangle - A polygon with four straight sides and four right angles, esp one with unequal adjacent sides.

Right Angle - An angle of 90 degrees.

Lesson

Area of a Rectangle Formula

$ext{Area} imes a * b$ , where a and b are the lengths of the sides of the rectangle.

If a rectangle has sides of length 4 and 5, for example, the area is

$ext{Area} = a imes b$

$ext{Area} = 4 imes 5$

$ext{Area} = 20$

Examples

Area of a Rectangle

\text{Area} = \text{Length} * \text{Width}

\text{Area} = 15 * 10

\text{Area} = 150

Area of a Rectangle (w/ Decimals)

\text{Area} = \text{Length} * \text{Width}

\text{Area} = 12.5 * 10.8

\text{Area} = 135