Multiply its length by its width.
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in order to find the area of a rectangle you must multiply the base of the rectangle by its height. This is also the same for most polygons
Area of rectangle with part of the shape missing = area of rectangle (lengthxwidth)-area of missing part.
Area of rectangle divided by its length = width of rectangle
To find the perimeter you add and to find the area we multiply.
If the base is a rectangle, use the formula for the area of a rectangle.