document.write( "Question 948770: Given: parallelogram XYZW; angle X=80 degrees
\n" ); document.write( "Prove: parallelogram XYZW is not a rectangle \n" ); document.write( "

Algebra.Com's Answer #579127 by Fombitz(32388) $\"\"$ $\"About$

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A rectangle has 4 angles that are each equal to 90 degrees.
\n" ); document.write( "For XYZW,
\n" ); document.write( " $\"X%2BY%2BX%2BY=360\"$
\n" ); document.write( " $\"X%2BY=180\"$
\n" ); document.write( " $\"80%2BY=180\"$
\n" ); document.write( " $\"Y=100\"$
\n" ); document.write( "Since XYZW has angles 80,100,80,100, it is not a rectangle.
\n" ); document.write( " \n" ); document.write( "

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