document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1122624>Question 1122624</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Let u and v be non-zero vectors in R^3 in standard position. Prove that if u and v are of length rcm each, where r is an element of R and r is greater than 0, then their tips lie on the surface of a sphere of radius rcm.  </SPAN>\n" );
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document.write( "???!!!<br><BR>\n" );
document.write( "What kind of \"proof\" do you want?<br><BR>\n" );
document.write( "A sphere with center at the origin and radius r cm consists of all the points that are r cm from the origin.<br><BR>\n" );
document.write( "If u and v are both vectors of length r cm in R^3 in standard position, then the ends of those vectors are two of the infinite number of points that make up the sphere. </SPAN>\n" );
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