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zad8)r=6,5
α=40°
wzor na dlugosc łuku L=α/360·2πr=40/360·2π·6,5=1/9·13π=13π/9
zad9
r=8
α=15°
wzor na pole wycinka P=α/360·πr²=15/360·8²π=1/24·64π=64π/24=8/3 pi cm²