Area = length x width
you may try the online calculator linked below that is related to this area and perimeter calculation of common shapes like rectangle, circle, triangle, parallelogram, rhombus and trapezoid.
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The area of rectangle is : 35.0
The area of rectangle is : 30.0
The area of rectangle is : 168.0
The area of rectangle is : 48.0
Area of rectangle with part of the shape missing = area of rectangle (lengthxwidth)-area of missing part.