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Pm=πr²
Pp=Pd-Pm
Pp=πR² -πr²
Pp=π(R²-r²)
1.
R=6
r=3
Pp=π(6² -3²) =π(36-9) =27π [j²]
2.
R=5
r=4:2 =2
Pp=π(5² -2²)=π(25-4) =21π [j²]
3.
R=4+2 =6
r=2
Pp=π(6² -2²) =π(36-4) =32π [j²]
P1 = 9π j²
P2 = 36π j²
P2 = P1 = 27π j² - pole pierścienia
2)
r1 = 4:2 = 2j
P1 = 4π j²
P2 = 25π j²
P2 - P1 = 21π j² - pole pierścienia
3)
r1 = 2j
r2 = 2+4 = 6j
P1 = 4π j²
P2 = 36π j²
P2 - P1 = 32π j² - pole pierścienia