document.write( "Question 936054: How can write the equation of a sphere given the endpoints of the diameter?
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Algebra.Com's Answer #569489 by TimothyLamb(4379)\"\" \"About 
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given the endpoints p1=(x1,y1,z1) and p2=(x2,y2,z2) of a diameter ...
\n" ); document.write( "find the center of the sphere, like so:
\n" ); document.write( "h = (x1-x2)/2
\n" ); document.write( "j = (y1-y2)/2
\n" ); document.write( "k = (z1-z2)/2
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\n" ); document.write( "now write the general equation for a sphere:
\n" ); document.write( "(x - h)^2 + (y - j)^2 + (z - k)^2 = r^2
\n" ); document.write( "where:
\n" ); document.write( "x,y,z are the coordinates of a point on the surface of the sphere
\n" ); document.write( "h,j,k are the coordinates of the center of the sphere
\n" ); document.write( "r is the radius of the sphere
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