To find the volume, you multiply the length times width times height.
example
length:4
width:5
height:2
4x5=20, 20x2=40.
Your answer would be 40.
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To find the volume of a prism, you multiply the area of the base by the height. In this case, the base is a rectangle with dimensions 10cm and 4cm, so the area is 10cm x 4cm = 40cm². The height of the prism is 2cm. Therefore, the volume of the prism is 40cm² x 2cm = 80cm³.
5x3x2 = 30 30cm^3
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 calculate the volume of a rectangle, you must multiply the length, the width, and the height--so the volume depends on the dimensions.
To find out the volume of a rectangle is just multiply length x height x width