This Lesson (MOVIE (FLASH) Geometry Similar Triangles) was created by by nutshellmath(0) : View Source, Show About nutshellmath: We provide great video lessons based on popular school textbooks.
This movie lesson reminds you the test of triangles similarity, when tree angles of the one triangle are congruent to respective angles of the second triangle. Using this test, it is proved, that the diagonals of the trapezoid create two similar triangles adjacent to the trapezoid parallel sides.
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