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a=6cm
d=pierwiatek(2)*a=6pierw(2)
g=przekątna gran.
g^2=10^2+6pier(2)^2
g=pier(100+72)
g≈13
cos=d/g=6pier(2)/13=8.46/13≈0,65
cos(0.65) wynosi między 40-41 stopni