Rectangles are flat or two dimensional. They have an area; they do not have a volume.
The area of a rectangle is its length x width.
If it was about the volume of a three dimensional Cuboid (or rectangular cuboid), its volume is the length x width x height.
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To calculate the volume of a rectangle, you must multiply the length, the width, and the height--so the volume depends on the dimensions.
If you are trying to find the ratio of the lengths of two similar rectangles, divide the length of one side of one rectangle by the corresponding side length of the other rectangle. To find the ratio between their volumes, divide the volume of one rectangle by the volume the other rectangle. To find volume, multiply the width of the rectangle by the length of the rectangle.
To find out the volume of a rectangle is just multiply length x height x width
Assuming the object is a rectangular parallelepiped, use its density to find its volume and solve the equation V abc for c where a, b, and c are the height, length and width respectively
A rectangle is a 2-dimensional object and cannot have a volume, which is a 3-dimensional concept. The volume of the rectangular prism or cuboid, whose dimensions are 4 by 5 by 3 is 4*5*3 = 60 cubic units.