document.write( "Question 1121389: Show that A(-2,4),B(2,0),C(2,8) and D(6,4) are the vertices of a square \n" ); document.write( "
Algebra.Com's Answer #737260 by Alan3354(69443)\"\" \"About 
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Find the 4 side lengths.
\n" ); document.write( "If they're equal, it's a parallelogram.
\n" ); document.write( "If they're equal, and one interior angle = 90 degs, it's a square.
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