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P - pole wycinka = παr²/360°
360P = παr²
r² = 360P/πα
α = 45°
P = 18 cm²
r² = 360 * 18/π45 = 8 * 18/π = 144/π
r = √144/π = 12/√π = 12√π/π cm
18=45/360*π*r²
18=1/8πr²/:1/8π
r²=144/π
r=12√π/π
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P - pole wycinka = παr²/360°
360P = παr²
r² = 360P/πα
α = 45°
P = 18 cm²
r² = 360 * 18/π45 = 8 * 18/π = 144/π
r = √144/π = 12/√π = 12√π/π cm
18=45/360*π*r²
18=1/8πr²/:1/8π
r²=144/π
r=12√π/π