[tex]S=DC^2*sin < DCB=10^2*sin135=100*\frac{\sqrt{2} }{2}=50\sqrt{2}[/tex] (см²)
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[tex]S=DC^2*sin < DCB=10^2*sin135=100*\frac{\sqrt{2} }{2}=50\sqrt{2}[/tex] (см²)