<PRE><B>Question 1193807</B>
Figure is a SQUARE.  You have the length value for one of the diagonals.  Not a problem!


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student confused
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SQUARE - all four sides of the figure are congruent.  The two  diagonals are congruent with each other.  Either diagonal will cut the figure into two special 45-45-90 right-triangles, and you can apply Pythagorean Theorem Formula, if you like to.  </PRE>