document.write( "Question 1024009: the centers of two circles of radii 3 and 5 are 17 units apart. find the lengh of a common external tangent
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Algebra.Com's Answer #639515 by ikleyn(52796) $\"\"$ $\"About$

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\n" ); document.write( "the centers of two circles of radii 3 and 5 are 17 units apart. find the length of a common external tangent.
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\n" ); document.write( "\n" ); document.write( "The two radii must be perpendicular to the common external tangent, hence the length should be $\"sqrt%2817%5E2+-+%285-3%29%5E2%29+=+sqrt%2817%5E2+-+2%5E2%29+=+sqrt%28285%29\"$ .\r
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\n" ); document.write( "\n" ); document.write( "See the lesson HOW TO construct a common exterior tangent line to two circles (Problem 2) in this site.\r
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