document.write( "Question 134976: On a coordinate plane P(0,4a) and Q(3a,0) are the endpoints of a diameter of a circle. What is the radius of the circle? \n" ); document.write( "

Algebra.Com's Answer #98830 by vleith(2983) $\"\"$ $\"About$

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You are given two points. The distance between two points is given as:\r
\n" ); document.write( "\n" ); document.write( " $\"distance+=+sqrt%28%28x2+-+x1%29%5E2+%2B+%28y2+-+y1%29%5E2%29\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"distance+=+sqrt%28%283a+-+0%29%5E2+%2B+%280+-+4a%29%5E2%29\"$
\n" ); document.write( " $\"distance+=+sqrt%28%283a%29%5E2+%2B+%28-4a%29%5E2%29\"$
\n" ); document.write( " $\"distance+=+sqrt%289a%5E2+%2B+16a%5E2%29\"$
\n" ); document.write( " $\"distance+=+sqrt%2825a%5E2%29\"$
\n" ); document.write( "distance = 5a\r
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