document.write( "Question 969291: Need help for this problem ty\r
\n" ); document.write( "\n" ); document.write( "The volume of the frustum of a regular triangular pyramid is 135 cu. M . The lower base is an equilateral triangle with an edge of 9cm . The upper base is 8m above the lower base . What is the upper base edge in meters \n" ); document.write( "
Algebra.Com's Answer #592209 by Edwin McCravy(20055)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "Did you really mean the mixed units of centimeters for the edge, meters for\r\n" );
document.write( "the distance between bases and cubic meters for the volume?  If so be sure\r\n" );
document.write( "to convert the centimeters to meters.\r\n" );
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document.write( "You need two formulas:\r\n" );
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document.write( "1. The volume of a frustrum of a pyramid:\r\n" );
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document.write( "\"V\"\"%22%22=%22%22\"\"expr%28h%2F3%29%28B%5B1%5D%2Bsqrt%28B%5B1%5DB%5B2%5D%29%2BB%5B2%5D%29\"\r\n" );
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document.write( "where h = height and B1, B2, are the areas \r\n" );
document.write( "of the two bases.\r\n" );
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document.write( "2. The area of an equilateral triangle:\r\n" );
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document.write( "\"A\"\"%22%22=%22%22\"\"expr%28sqrt%283%29%2F4%29%2As%5E2\"\r\n" );
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document.write( "where s is the length of each of the 3 equal sides of the equilateral triangle.\r\n" );
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document.write( "Step 1. Find the area of the lower base by substituting the given value for s\r\n" );
document.write( "in the 2nd formula. The value you get for A will be the value of B1.   \r\n" );
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document.write( "Step 2. Substitute the given values for V, h, and and the value you got for B1 in \r\n" );
document.write( "step 1, into the first formula and solve for B2. This will involve\r\n" );
document.write( "isolating the square root term, squaring both sides and solving a quadratic.\r\n" );
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document.write( "Step 3. Substitute what you got for B2 in step 2 for A in the second\r\n" );
document.write( "formula, and solve for s.\r\n" );
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document.write( "Good luck.  Be sure you don't mix centimeters and meters. \r\n" );
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document.write( "Edwin
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