Pole koła jest równe 81 pi cmm kwadratowych. Oblicz obwód
81π = π r²
81=r²
r=9
Obw=2π r = 2π * 9 = 18π [cm]
P=81π cm²
L=?
P=πr²
L=2πr
81π=πr² I:π
r²=81
r=9cm
L=2*π*9
L=18πcm
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81π = π r²
81=r²
r=9
Obw=2π r = 2π * 9 = 18π [cm]
P=81π cm²
L=?
P=πr²
L=2πr
81π=πr² I:π
r²=81
r=9cm
L=2πr
L=2*π*9
L=18πcm