

Area of a rectangle
From Latin: area  "level ground, an open space,"
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
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
 In the figure above, click on "hide details"
 Drag the orange dots on the vertices to make a randomsize rectangle.
 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.
Other polygon topics
General
Types of polygon
Area of various polygon types
Perimeter of various polygon types
Angles associated with polygons
Named polygons
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