document.write( "Question 958499: A circular garden has a radius of 16 feet. You want to lay a concrete sidewalk 2 feet wide around the entire garden. If the walk will be 3 inches thick, how many yards of concrete will you need to order? \n" ); document.write( "

Algebra.Com's Answer #585848 by macston(5194) $\"\"$ $\"About$

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inside walk radius=r=16 ft=5.33yd; outside walk radius=R=18ft=6yds
\n" ); document.write( "A=Area of walk=(area of outside circle)-(area of inside circle)
\n" ); document.write( " $\"A=%28%28pi%29R%5E2%29-%28%28pi%29r%5E2%29\"$
\n" ); document.write( " $\"A=%28pi%29%286yds%29%5E2-%28pi%29\"$ $\"%285.3yds%29%5E2\"$
\n" ); document.write( " $\"A=36%28pi%29yd%5E2-28.4%28pi%29yd%5E2\"$
\n" ); document.write( " $\"A=7.6%28pi%29yd%5E2\"$ = $\"23.7yd%5E2\"$
\n" ); document.write( "Area x Thickness will give volume Thickness=0.083yds
\n" ); document.write( " $\"Volume=%2823.74yd%5E2%29%280.083yd%29\"$ = $\"1.99yd%5E3\"$
\n" ); document.write( "ANSWER: You will need 1.99 yards of concrete for the walk. \n" ); document.write( "

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