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Mind Expander
The four triangles are similar because they satisfy the criteria of triangle similarity, which can include having equal corresponding angles or having sides in proportion. If all three angles of one triangle are equal to all three angles of another triangle, for instance, then by the Angle-Angle (AA) similarity postulate, those triangles are similar! Also, consider the properties of transversals and parallel lines: when a line is drawn parallel to one side of a triangle, it creates smaller triangles that are similar to the original triangle. So, if triangles share such properties, they exhibit the delightful dance of similarity!