document.write( "Question 760882: Hi, I'm doing my Junior Cert next year and I have been practising sample papers but I don't know how to do this question! :( Plese Help! :)\r
\n" ); document.write( "\n" ); document.write( "Deirdre constructs a “polytunnel” on a level part of her back
\n" ); document.write( "garden. Five vertical, semicircular metal hoops, each of
\n" ); document.write( "radius 2 m are attached to brackets at ground level and
\n" ); document.write( "covered with a polythene sheet. The hoops are 2 m apart.\r
\n" ); document.write( "\n" ); document.write( "Find the volume of air in the tunnel.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Thanks in advance! :)\r
\n" ); document.write( "\n" ); document.write( "-Lauryn \n" ); document.write( "
Algebra.Com's Answer #462896 by Cromlix(4381)\"\" \"About 
You can put this solution on YOUR website!
Hi Lauryn,
\n" ); document.write( "If you just consider your polytunnel as a whole cylinder, work out the volume for the whole cylinder and then halve it.
\n" ); document.write( "Length of polytunnel = 8m (4 x 2m)
\n" ); document.write( "Volume = Pi r^2 h (Using length instead of height)
\n" ); document.write( " = Pi* 2^2 * 8m
\n" ); document.write( " = 100.53m^3
\n" ); document.write( "Halve it
\n" ); document.write( " = 50.3m^3 (1 decimal place).
\n" ); document.write( "Hope this helps.
\n" ); document.write( ":-) \n" ); document.write( "
\n" );