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r-promień podstawy stożka
l- tworząca stożka
α=½*90°=45°
h=45°
tg45°=1
tg45°=r/h
1=r/10
r=10
sin45°=√2/2
sin45°=r/l
√2/2=10/l
l√2=2*10
l√2=20 /:√2
l=20/√2* √2/√2
l=10√2