document.write( "Question 845210: need to find the measure of the fourth angle in each quadrilateral
\n" ); document.write( "90 degrees, 50 degrees, 48 degrees, x
\n" ); document.write( "X equals what?
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Algebra.Com's Answer #509178 by pmesler(52)\"\" \"About 
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To begin you should know that the sum of all the angles in a quadrilateral = 360 degrees.\r
\n" ); document.write( "\n" ); document.write( "Now that we know that the sum is 360 and we know the other three angles, it will be easy to solve for x.\r
\n" ); document.write( "\n" ); document.write( "90 + 50 + 48 + x = 360.\r
\n" ); document.write( "\n" ); document.write( "188 + x = 360.\r
\n" ); document.write( "\n" ); document.write( "Subtract 188 from both sides to simplify and isolate x.\r
\n" ); document.write( "\n" ); document.write( "x = 172. Therefore x is 172 degrees. \r
\n" ); document.write( "\n" ); document.write( "Now let's check to see if this is correct\r
\n" ); document.write( "\n" ); document.write( "90 + 50 + 48 + 172 = 360 \r
\n" ); document.write( "\n" ); document.write( "360 = 360. It checks out. The problem is solved.
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