document.write( "Question 1142429: the slant height of a cone is twice it's base radius r, express the total surface area of the cone in terms of π and r \n" ); document.write( "

Algebra.Com's Answer #763148 by greenestamps(13200) $\"\"$ $\"About$

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\n" ); document.write( "Base area = $\"%28pi%29%28r%5E2%29\"$

\n" ); document.write( "Lateral surface area: $\"%28pi%29%28r%29%28l%29\"$ where l is the slant height; so
\n" ); document.write( "lateral surface area = $\"%28pi%29%28r%29%282r%29\"$

\n" ); document.write( "Total surface area = base area plus lateral surface area. \n" ); document.write( "

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