document.write( "Question 117362This question is from textbook McDougal Littell Geometry
\n" ); document.write( ": well, its not really from the book but i just hope that someone could help me anyway. it is off a study guid for school for a semester test. There is a Trapezoid and the measure of angle A= 90 degrees.the measure of angle C= 50 degrees. the measure of angle D= 90, and find the measure of angle B? that is the best way that i can explain it because there is a picture that goes with it and i cant get it on the computer. \n" ); document.write( "
Algebra.Com's Answer #85374 by jim_thompson5910(35256)\"\" \"About 
You can put this solution on YOUR website!
Let x=angle measure of angle B\r
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\n" ); document.write( "\n" ); document.write( "A trapezoid has 4 sides. So this means that the sum of all 4 angles is 360 degrees. So this means \r
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\n" ); document.write( "\n" ); document.write( "\"A%2BB%2BC%2BD=360\"\r
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\n" ); document.write( "\n" ); document.write( "Now plug in the given values\r
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\n" ); document.write( "\n" ); document.write( "\"90%2Bx%2B50%2B90=360\"\r
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\n" ); document.write( "\n" ); document.write( "\"x%2B230=360\" Combine like terms on the left side\r
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\n" ); document.write( "\n" ); document.write( "\"x=360-230\"Subtract 230 from both sides\r
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\n" ); document.write( "\n" ); document.write( "\"x=130\" Combine like terms on the right side\r
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\n" ); document.write( "\n" ); document.write( "Answer:\r
\n" ); document.write( "\n" ); document.write( "So our answer is \"x=130\" \r
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\n" ); document.write( "\n" ); document.write( "So the measure of angle B is 130 degrees
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