You know that the diagonals bisect each other.SO, In △ DMCSIDES DM and MC are 12 of BD and AC respectively.Now you know the lengths of two sides containing the right angle in a right-angled triangle, you can easily find the THIRD side i.e. AC by using the Pythagoras Theorm.And all the sides of a rhombus are EQUAL so you have your answer.
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