Posted by sam on Monday, April 4, 2011 at 8:53pm.
in a rhombus, the diagonals are perpendicular , so if you divide each diagonal in half (where they intersect) than you get a right triangle with sides 3 4 and x. Use pythagorean theorum and that side is 5. Because all sides of a rhombus are congruent, each side is 5, so the perimeter is 20. Hope i helped!:)
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