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9-25.

Find the surface area and volume of the rectangular prism at right.

Each edge of the above rectangular prism is unit.

Surface area is the total area of the surfaces of an object.

Volume is the space that an object occupies:
To find the volume, multiply the volume of one layer by the number of layers.

cubes make up this object.
How many sides act as a surface for the object and count towards the surface area?