A rectangle is a two dimensional geometric concept. It has no thickness and so no volume. It, therefore, cannot have any weight.
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If the base is a rectangle, use the formula for the area of a rectangle.
In the formula for the rectangle, put the width equal to the length.
Square is a special case of a rectangle and the same formula may be used to find the perimeter
of course base times height for a square or rectangle. but for a trapezoid a= h x "b1+b2"
A traingle covers half the area of a rectangle with the same base and [perpendicular] height.