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OpenStudy (anonymous):
In rectangle ABCD, diagonal AC = (3x -9) and diagonal BD = (x+13). What Is AC?
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Directrix (directrix):
Theorem: The diagonals of a rectangle are congruent. So, AC = BD 3x - 9 = x + 13 Solve for x and then substitute that value in AC = (3x -9) @WalterMccollum
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