Ich habe dann folgendes gerechnet:
(1) * y - (2) * x <=> y2 - x2 = 0 <=> y2 = x2 <=> y = x
in NB: x2 + y2 - r2 <=> x2 + x2 - r2 = 0 <=> 2x2 = r2 <=> x2 = r2/2 <=> x1 = r/\( \sqrt{2} \), x2 = - r/\( \sqrt{2} \)
in y = x:
P1( r/\( \sqrt{2} \), r/\( \sqrt{2} \))
P2( r/\( \sqrt{2} \), -r/\( \sqrt{2} \))
P3( -r/\( \sqrt{2} \), r/\( \sqrt{2} \))
P4 ( -r/\( \sqrt{2} \), -r/\( \sqrt{2} \))
so korrekt?