Odpowiedź:
[tex]|DM|=\sqrt{|DS|^{2}-|SM|^{2}} = \sqrt{|DS|^{2} -r^{2} }= \sqrt{|DS|^{2} - |DE|^{2} }= |DE|\\ \\ |SM|=|SE|=|SF|=|MA|=|NG| i |DE|=|BN|\\ \\ |MN|=|MS|+|SN|=|MA|+|BN|=|MA|+|DE|=|MA|+|DM|=|AD|[/tex]
