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½p=12cm
pole=√12(12-7)(12-8)(12-9)=√12×5×4×3=√720=12√5cm²
promień okregu wpisanego=r
r=12√5:12=√5cm
promień okregu opisanego=R
R=7×8×9:4×12√5=504:48√5=2,1√5cm