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Find the volume of the prism at right. All angles are right angles.  

Find the area of the base (which is the side facing you) and multiply by the height of mm.

The base can be divided into two rectangles. One that is mm by mm and one that is mm by mm.

Find the area of each smaller rectangle and add them together.

Now multiply the area you found for the base by the height to get the total volume of the prism.

A prism where the base can be drawn as follows in millimeters: 3 right, 3 up, 9 right, 3 down, 3 right, 7 down, 15 left, 7 up to enclose the base. The height of the prism is 5.