document.write( "Question 1016598: How to solve the measure of fourth angle of a quadrilateral given the three angles \n" ); document.write( "
Algebra.Com's Answer #632970 by Fombitz(32388)\"\" \"About 
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The angles of a quadrilateral sum to 360.
\n" ); document.write( "So if you know 3 of them, you can solve for the fourth.
\n" ); document.write( "\"A%5B4%5D=360-A%5B1%5D-A%5B2%5D-A%5B3%5D\"
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