A shape is said to be self-similar if it will map onto an enlargement of a part of itself.
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Similar polygons have congruent angles and the same shape (but not necessarily the same size). Since the shape of a square and a rectangle is different from the shape of a trapezoid, they are not similar to it.
An ellipse is the proper name for an oval shape, however, a circle is a closed curved shape similar to an oval shape.
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Similar.
Similar means they are of the same shape but not necessary the same size. two figure are congruents when they are of the same shape and size. congruent figures can be similar but not similar figures aren't always congruent