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πr = 7π / : π
r = 7
r = 14
πr² = π · 14² = 196π
· 196π = · 196π = 49π
Odp: Pole wycinka koła wynosi 49π
πr² = 27π / : π
r² = 27 / · 4
3r² = 108
r² = 36
r = 6
2πr = 12π = 9π
Odp: Długość łuku wynosi 9π.