document.write( "Question 136199: Three faces of a box have a common vertex and their combined area is 20cm^2. What is the total surface area of the box? Thank you \n" ); document.write( "
Algebra.Com's Answer #99758 by josmiceli(19441)\"\" \"About 
You can put this solution on YOUR website!
Each of the 3 faces has an identical face opposite it, so
\n" ); document.write( "the total area is 20 vm2 + 20 cm2 = 40 cm2.
\n" ); document.write( "
\n" ); document.write( "
\n" );