the face of a cube, a cd case, a picture, the side of a house, etc...
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A CD case is rectangular, not square.
The side of a house is rarely a square. Often it is not even rectangular.
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An excellent real life example of a square pyramid are the Pyramids at Giza. They have four sides at the base and come to a point.
a real life example of an octagon is a stop sign.
A pennant is a real life example of an isosceles triangle.
A pyramid like in Egypt or something like that. Or a triangular tent