Directions: Explain the following problem using the concept of triangle congruency. 1. The figure shows a side view of an ironing board. So that the board may be positioned at several different heights, the legs are hinged at H, and point B is free to slide along a track on the underside. In addition, CH = BH and AH = DH. Using congruent triangles, explain how this design ensures that, no matter what height the board is set to, it will always remain horizontal. B

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