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a) 1. L=2П
2. L=4П
3. L=2.8П
4. L=4/7П
5. L=6.28П
L=dП d-średnica okręgu
b) 1. L=П
2. L=5П
3. L=2/3П
4.4.2П
5.3.14П
P=Пr²
r²=P/П
C) 1. r²=П/П=1 --> r=1
2. r²=2/П --> r=√2/√П
3. r²=10П/П=10 --> r=√10
4. r²=0.6П/П=0.6 --> r=√0.6
5. r²=6.28/П --> r=√6.28/√П