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# Area of a rectangle

The number of square units it takes to completely fill a rectangle.
Formula: Width × Height
Try this Drag the orange dots to move and resize the rectangle. As the size of the rectangle changes, the area is recalculated.

## Area formula

The area of a rectangle is given by multiplying the width times the height. As a formula: where
w  is the width
h  is the height

## Calculator

 ENTER THE TWO SIDE LENGTHS Side 1 clear Side 2 clear Area: Perimeter: Diagonal:

Use the calculator on the right to calculate the properties of a rectangle.

Enter the two side lengths and the rest will be calculated. For example, enter the two side lengths. The area, perimeter and diagonal lengths will be found.

## Try this

1. In the figure above, click on "hide details"
2. Drag the orange dots on the vertices to make a random-size rectangle.
3. Now try to estimate the area of the rectangle just looking at the squares inside it
When you done click "show details" to see how close you got.