document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=472082>Question 472082</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A parallelogram is a ____________ if and only if it has at least one right angle and four congruent sides.<BR>\n" );
document.write( "a. rectangle<BR>\n" );
document.write( "b. square<BR>\n" );
document.write( "c. rhombus<BR>\n" );
document.write( "d. none \r<BR>\n" );
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document.write( "Please provide detail explanation. Thanks. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #323695 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=323695\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> If a parallelogram has one right angle, then the other angles are right angles (since the opposite angle is equal and the adjacent angles are supplementary).\r<BR>\n" );
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document.write( "So there are 4 right angles. Since we have 4 right angles and 4 congruent sides, we have a square.\r<BR>\n" );
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document.write( "So...\r<BR>\n" );
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document.write( "A parallelogram is a <u>square</u> if and only if it has at least one right angle and four congruent sides\r<BR>\n" );
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document.write( "making the answer choice B. </SPAN>\n" );
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