document.write( "Question 150090: Solving the formula L=2d+pi(a+r) for a. \n" ); document.write( "
Algebra.Com's Answer #110162 by nerdybill(7384)\"\" \"About 
You can put this solution on YOUR website!
The idea is to isolate 'a' to one side of the equation -- doesn't matter which side.
\n" ); document.write( ".
\n" ); document.write( "L=2d+pi(a+r)
\n" ); document.write( "Start by subtracting 2d from both sides to get:
\n" ); document.write( "L-2d = pi(a+r)
\n" ); document.write( ".
\n" ); document.write( "Now, divide both sides by pi:
\n" ); document.write( "(L-2d)/pi = a+r
\n" ); document.write( ".
\n" ); document.write( "Finally subtract r from both sides:
\n" ); document.write( "((L-2d)/pi) - r = a
\n" ); document.write( "
\n" ); document.write( "
\n" );