document.write( "Question 896510: a circle is inscribed in a equilateral triangle,its radius is 4,how to find its side? \n" ); document.write( "
Algebra.Com's Answer #543622 by Edwin McCravy(20055)\"\" \"About 
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document.write( "Draw OB perpendicular to the bottom side at B.\r\n" );
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document.write( "Radius OA bisects 60° angle at A, so angle OAB = 30° \r\n" );
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document.write( "AB is half the side.  OA is a radius = 4.\r\n" );
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document.write( "\"AB%2FOA=cos%28%2230%B0%22%29\"\r\n" );
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document.write( "\"AB%2F4+=+sqrt%283%29%2F2\"\r\n" );
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document.write( "\"AB=4sqrt%283%29%2F2\"\r\n" );
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document.write( "\"AB=2sqrt%283%29\"   <-- half a side\r\n" );
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document.write( "\"SIDE=4sqrt%283%29\", approximately 6.92820323\r\n" );
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document.write( "Edwin

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