obwód koła 2piR
18pi=2piR |:2pi
9=R
Pole koła piR^@
P=pi9^2
P=81pi
odp.: Pole koła wynosi 81pi cm2
O = 18π cm
2*π*r = 18*π /:2π
r = 9 cm
P = π*r²
P = π*(9 cm)²
P = 81*π cm²
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obwód koła 2piR
18pi=2piR |:2pi
9=R
Pole koła piR^@
P=pi9^2
P=81pi
odp.: Pole koła wynosi 81pi cm2
O = 18π cm
2*π*r = 18*π /:2π
r = 9 cm
P = π*r²
P = π*(9 cm)²
P = 81*π cm²