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d=l=10II
r=d:2=10:2=5
P=II r²
P=II5² więc 25 II
odp. B!
10 pi = pi * d / :pi
10 = d
d=10 - średnica koła
promień: 10: 2 = 5 cm
P= pi r kwadrat
P = pi * 5 do kwadratu
P= 25 pi cm kwadratowych
Odp. B
ob = 10 pi
10 pi = 2pi r
pi sie skraca zostaje: 10=2r
wiec r =5
pole koła: pi r2
pi*5 do kwadretu
pi * 25
p = 25 pi cm 2
odp b