document.write( "Question 313985: The measures of three angles of a quadrilateral are 80, 90, and 103 degrees. Find the measure of the fourth angle. \n" ); document.write( "
Algebra.Com's Answer #224457 by rapaljer(4671)\"\" \"About 
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Add the given angles together and subtract from 360 degrees.\r
\n" ); document.write( "\n" ); document.write( "80+90+103=273 degrees\r
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\n" ); document.write( "\n" ); document.write( "360-273= 87 degreees.\r
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\n" ); document.write( "\n" ); document.write( "Dr. Robert J. Rapalje, Retired
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