document.write( "Question 407197: a cylinder of height h cm and radius r cm stands on a table. a cone of height H cm is placed over the cylinder and the rests on the table wit the top of the cylinder touching the inside of the cone. the ratio r:R is 2:5
\n" ); document.write( "use the given ratio to write an expression for r in terms of R
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Algebra.Com's Answer #287069 by robertb(5830)\"\" \"About 
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\"r%2FR+=+2%2F5\" ==> \"r+=+%282%2F5%29R\"\r
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\n" ); document.write( "On a related note, you can actually find a relationship between h and H:\r
\n" ); document.write( "\n" ); document.write( "A vertical cross-section passing through the apex of the cone produces two similar right triangles:
\n" ); document.write( "The top triangle has horizontal leg r and vertical leg H - h.
\n" ); document.write( "The bottom triangle has horizontal leg R - r and vertical leg h. Hence
\n" ); document.write( "by similarity of triangles,\r
\n" ); document.write( "\n" ); document.write( "\"h%2F%28R+-+r%29+=+%28H+-+h%29%2Fr\"
\n" ); document.write( "==> \"hr+=+%28H+-+h%29%28R+-+r%29\"
\n" ); document.write( "<==> \"hr+=+HR+-+Hr+-+hR++%2Bhr\"
\n" ); document.write( "<==> \"Hr+=+%28H+-+h%29R\"
\n" ); document.write( "<==> \"r+=+%28%28H+-+h%29%2FH%29R\"\r
\n" ); document.write( "\n" ); document.write( "then use \"r+=+%282%2F5%29R\" to find a relationship between h and H.
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