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R=a√2/2
Pkw=πR²=(a√2/2)²π
Pko=2a²/4 *π
Pko=a²/2 *π
r=a/2
Pkw=πr²
Pkw=(a/2)² *π
Pkw=a²/4 *π
Pko/Pkw=πR²/πr²=a²/2π/a²/4π=a²/2 * 4/a²=2
Pko=pole koła opisanego
Pkw=pole koła wpisanego
r= 1/2A
pole= π(²= πA²