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0,6π*r²=6π
r²=10
r=√10
obw = 2π*√10
obw=2√10 π
obw ≈2*3,16*3,14
obw ≈ 19,8448 cm
Pozdrawiam! :)
216-6π [cm²]
360-x
x=2160π/216
x=10π cm² -pole koła
10π=πr²
r²=10
r=√10 cm
Obw=2πr
obw=2π√10 cm