document.write( "Question 1143360: The distance from the centre of a circle to a point P outside the circle is 12 mm.
\n" ); document.write( "The length of the tangent segment from P to the circle is 9 mm. Determine the
\n" ); document.write( "radius of the circle.
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Algebra.Com's Answer #764141 by josmiceli(19441) $\"\"$ $\"About$

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The tangent to the circle makes a 90 degree angle with the radius
\n" ); document.write( "One leg of the right triangle is 9 mm
\n" ); document.write( "The hypotenuse is 12 mm
\n" ); document.write( " $\"+a%5E2+%2B+b%5E2+=+c%5E2+\"$
\n" ); document.write( " $\"+a%5E2+%2B+9%5E2+=+12%5E2+\"$
\n" ); document.write( " $\"+a%5E2+=+144+-+81+\"$
\n" ); document.write( " $\"+a%5E2+=+63+\"$
\n" ); document.write( " $\"+a+=+7.937+\"$
\n" ); document.write( "The radius is 7.937 mm
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