document.write( "Question 729413: What is the equation of the circle with center at (-3, 0) and diameter 20? \n" ); document.write( "
Algebra.Com's Answer #446027 by MathLover1(20850)\"\" \"About 
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formula for circle is:\r
\n" ); document.write( "\n" ); document.write( " \"%28x-h%29%5E2+%2B+%28y-k%29%5E2+=+r%5E2\" where \"h\" and \"k\" are coordinates of the center, and \"r\" is the radius\r
\n" ); document.write( "\n" ); document.write( "you are given: center at (\"-3\", \"0\") and diameter \"d=20\"\r
\n" ); document.write( "\n" ); document.write( "(\"-3\", \"0\")=(\"h\", \"k\"); so, \"h=-3\" and \"k=0\"\r
\n" ); document.write( "\n" ); document.write( "\"d=20\" and we know that \"r=d%2F2\"..=>..\"r=10\"\r
\n" ); document.write( "\n" ); document.write( "now, when you have \"h=-3\", \"k=0\", and \"r=10\", plug it in formula\r
\n" ); document.write( "\n" ); document.write( "\"%28x-h%29%5E2+%2B+%28y-k%29%5E2+=+r%5E2\"\r
\n" ); document.write( "\n" ); document.write( "\"%28x-%28-3%29%29%5E2+%2B+%28y-0%29%5E2+=+10%5E2\"\r
\n" ); document.write( "\n" ); document.write( "\"%28x%2B3%29%5E2+%2B+y%5E2+=+100\"\r
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