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OBL P
h=R*cos 22,5°
a/2=R*sin 22,5°
pole jednego trojkata
P1=h*a/2=R²sin 22,5°*cos 22,5°
sin2α=2sinα* cosα
P1=1/2R²sin 45°
P=8*p1=4R²sin 45°=4R²*√2/2=2R²√2
P=2*36*√2
ODP
P=72√2