Multiply the length and width to find the area of both a rectangle and square.
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30 square feet
To find the area of a rectangle, you simply multiply its length by its width. In this case, the length is 21m and the width is 17m. Therefore, the area of the rectangle would be 21m x 17m = 357 square meters.
if a rectangle has width of 5 and diagonal with lenght of 13, what is the area of the rectangle? Use Pythagoras' theorem to find the length of the rectangle which will be 12 5*12 = 60 square units
Area of a square/rectangle=its length × its width
Area of a rectangle= length x height.For example:A 2' by 4' rectangle would have an area of 2 x 4 = 8 square feet.As a formula, it is L*W=A.