Ukuthola indawo yombuthano: ifomula nezibonelo

Circle isithombe sejometri; isethi amaphuzu endizeni elele ngaphakathi kwendingilizi.

Ifomula yendawo

Ububanzi

Indawo yombuthano (S) ilingana nomkhiqizo wenombolo π kanye nesikwele sobubanzi bayo.

S = π ⋅ r ²

Irediyasi yesiyingi (r) ingxenye yomugqa exhuma isikhungo sayo nanoma yiliphi iphuzu embuthanweni.

Qaphela: ngokubala inani lenombolo π kuhlanganiswe kuze kufike ku-3,14.

Ngobubanzi

Indawo yombuthano iyingxenye yesine yomkhiqizo wenombolo π nesikwele sobubanzi bayo;

Ububanzi bombuthano (d) ilingana nama-radii amabili (d = 2r). Lena ingxenye yomugqa ehlanganisa amaphuzu amabili aphikisanayo kumbuthano.

Izibonelo zemisebenzi

Umsebenzi 1

Thola indawo yendilinga ene-radius engu-9 cm.

Isinqumo:

Sisebenzisa ifomula lapho irediyasi ibandakanyeka khona:

S = 3,14 ⋅ (9 cm)² = 254,34cm².

Umsebenzi 2

Thola indawo yendilinga enobubanzi obungu-8 cm.

Isinqumo:

Sisebenzisa ifomula lapho ububanzi buvela khona:

S = 1/4 ⋅ 3,14 ⋅ (8 cm)² = 50,24cm².