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 #639507 by robertb(5830) $\"\"$ $\"About$

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The two radii must be perpendicular to the common external tangent, hence the length should be $\"sqrt%2817%5E2+-+%285-3%29%5E2%29+=+sqrt%2817%5E2+-+2%5E2%29+=+sqrt%28285%29\"$ . \n" ); document.write( "

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