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How to Know What the Base of a Prism Is?

    • 1). Look at one of the prism's faces. Measure the edges of the faces and write them down.

    • 2). Turn the prism over one-half rotation.

    • 3). Confirm that the face on this side of the prism is the same shape as the other, and that the two are parallel.

    • 4). Measure the edges on this face with a ruler. If the measurements match the previous face, you have located the base.

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