Oblicz promień koła o podanym polu a 100πcm² b 25πcm² c 5 cztery dziewiąte d 0,0036πm² e 12 100πm²

a) 100πcm² P=πr² 100πcm²=πr² /:π r²=100cm² r=10cm b) 25πcm² 25πcm²=πr² /:π 25cm² = r² r=5cm c) 5 4/9 π = 49/9π 49/9π = πr² /:π r²=49/9 r=7/3 d) 0,0036πm² 0,0036πm² = πr² /:π 0,0036m² = r² r=0,06m e) 12 100πm² 12 100πm² = πr² /:π 12100m²=r² r=110m

a)100πcm²=πr²/ :π 100cm²=r²/√ r=10cm b)25πcm²=πr²/ :π 25cm²=r²/√ r=5cm c)49/9πcm²=πr²/ :π 49/9cm²=r²/√ r=7/3(jednostaka nie pewna) d)0,0036πm²=πr²/ :π 36/10000=r²/√ r=6/100m e)12100πm²=πr²/ :π 12100cm²=r²/√ r=110m