Ukuthola indawo yesendlalelo esiyindilinga

Kulolu shicilelo, sizocubungula amafomula angasetshenziswa ukubala indawo engaphezulu yesendlalelo esiyindilinga (ucezu lwebhola): eyindilinga, izisekelo kanye nengqikithi.

Incazelo yesendlalelo esiyindilinga

Isendlalelo esiyindilinga (noma ucezu lwebhola) – lena ingxenye esele phakathi kwezindiza ezimbili ezifanayo eziphambanayo. Isithombe esingezansi sinombala ophuzi.

• R iyiradiyasi yebhola;
• r₁ iyiradiyasi yesisekelo sokuqala sokusika;
• r₂ iyiradiyasi yesisekelo sokusika sesibili;
• h ukuphakama kongqimba oluyindilinga; perpendicular ukusuka enkabeni yesisekelo sokuqala kuya enkabeni yesibili.

Ifomula yokuthola indawo yesendlalelo esiyindilinga

indawo eyindilinga

Ukuze uthole indawo eyindilinga yongqimba oluyindilinga, udinga ukwazi i-radius yebhola, kanye nokuphakama kokusikwa.

S_{izifunda zezifunda} = 2πRh

Amagesi

Indawo yezisekelo zocezu lwebhola ilingana nomkhiqizo wesikwele serediyasi ehambisanayo ngenombolo π.

S₁ =r₁²

S₂ =r₂²

Indawo egcwele

Indawo ephelele yongqimba oluyindilinga ilingana nesamba sezindawo eziyindilinga nezisekelo ezimbili.

S_{isifunda esigcwele} = 2πRh + πr₁² +πr₂² = π(2Rh + r₁² +r₂²)

amanothi:

• uma esikhundleni se-radii (R, r₁ or r₂) ama-diameter anikezwe (d), lokhu kwakamuva kufanele kuhlukaniswe ngo-2 ukuze kutholwe amanani erediyasi oyifunayo.
• inani lenombolo π lapho wenza izibalo, imvamisa ifinyezwa ezindaweni ezimbili zamadesimali - 3,14.