promień wewnętrzny pierścienia jest równy 2 cm , zaś promień zewnętrzny 2,5 dm . oblicz pole tego pierścienia
1- wewnętrzny
r1 = 2 cm
P1 = πr²
P1 = π2²
P1 = 4π
2- zewnetrzny
r2 = 2,5 dm = 25 cm
P2 = πr²
P2 = π25²
P2 = 625π
Pole pierscienia = 625π-4π = 621π
Ppierścienia=p2-p12,5dm=25cmp2=pirdo2p2=pi x 25do2p2=625pi (cmdo2)p1=pi x 4p1=4pi(cmdo2)pp=645pi-4pipp=641pi (cmdo2) pole pierścionka
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1- wewnętrzny
r1 = 2 cm
P1 = πr²
P1 = π2²
P1 = 4π
2- zewnetrzny
r2 = 2,5 dm = 25 cm
P2 = πr²
P2 = π25²
P2 = 625π
Pole pierscienia = 625π-4π = 621π
Ppierścienia=p2-p1
2,5dm=25cm
p2=pirdo2
p2=pi x 25do2
p2=625pi (cmdo2)
p1=pi x 4
p1=4pi(cmdo2)
pp=645pi-4pi
pp=641pi (cmdo2) pole pierścionka