Length times width times height(length * width * height or L * W * H) but only if it is like a box or cube of some sort which I believe it is because you said "3D". A 2 dimensional or 2D rectangle can not have a volume.
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Rectangles have area. 50 square cm in this case.
Yes a prism is a 3D rectangle
Volume of rectangle is 0
A rectangle has no volume, it is a 2 dimensional object.
A prism. A rectangle is a special kind of prism. It is called a cuboid.