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The rectangular prism can cause some problems for the K-6 student, not because it is complicated, but because they have not learned the organization of shapes properly. They have learned that a square is a square, and a rectangle a rectangle - but have failed to make the connection that a square is a rectangle.
But warning! Just because a square is a rectangle, does not make a rectangle a square
For these types of situations, I like to use something that kids are familiar with, such as fruit.
We have the group of foods called fruits. Now an apple is a fruit, an orange is a fruit, but this does not mean an apple is an orange!
We know that it is a prism, which means that it is made up of two identical shapes, which in turn are connected with straight and parallel lines.
As it is a Rectangular Prism, we know the two identical shapes are rectangles.
Cuboid is simply ANOTHER NAME for a Rectangular Prism!
The short answer - YES, but why?
Look at the definition of a rectangle above. Does the square fit this description? Yes. It is a quadrilateral. It does have 4 right angles. They are all parallel and the opposite sides are of equal length. So a square is a rectangle, which means that a cube is a prism or a cuboid!
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