Select any vertex.
There are three faces that meet at that vertex. Find the vertex at which the other three faces meet. The line joining these two vertices is the principal diagonal of the rectangular prism.
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It is a rectangle.
Draw a straight line segment connecting two opposite corners of one of the rectangular faces (a diagonal).
Volume of a Rectangular Prism The volume of a rectangular prism can be found by the formula: volume=length*width*height
Just knowing the volume in centimeters cubed of a rectangular prism would not allow you to find the dimensions.
The base of a rectangular prism is a rectangle. The area of a rectangle is length times width.