document.write( "Question 829953: The area of a trapezoid is 162cm2(squard). The height is 18cm and the length of one of the parallel sides is 6cm. Find the length of the second parallel
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Algebra.Com's Answer #500255 by Edwin McCravy(20056)\"\" \"About 
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document.write( "In a trapezoid with a certain height, and two parallel sides,\r\n" );
document.write( "it does not matter which way the non-parallel sides slant,\r\n" );
document.write( "or whether one of them is vertical.  We know the other base is\r\n" );
document.write( "longer than 6 because if it were 6 the area would only be 6x18\r\n" );
document.write( "or 108.  So let's draw the trapezoid with the unknown parallel\r\n" );
document.write( "side longer that the given one and one of the non-parallel\r\n" );
document.write( "side vertical:\r\n" );
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document.write( "Now we'll draw in a (green) altitude to show that the area is\r\n" );
document.write( "just the area of a rectangle plus the area of a triangle.\r\n" );
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document.write( "Area of rectangle + Area of triangle = Area of trapezoid:\r\n" );
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document.write( "         \"%286%29%2818%29+%2B+expr%281%2F2%29%28x%29%2818%29\"\"%22%22=%22%22\"\"162\"\r\n" );
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document.write( "         108 + 9x = 162\r\n" );
document.write( "               9x = 54\r\n" );
document.write( "                x = 6\r\n" );
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document.write( "So the other (bottom) base of the trapezoid = 6+x = 6+6 = 12\r\n" );
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document.write( "Answer:  12 cm\r\n" );
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document.write( "Edwin
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