Tse ka Hare
Khatisong ena, re tla sheba mokhoa oa ho bala sebaka se kaholimo sa "rectangular parallelepiped" le ho sekaseka mohlala oa ho rarolla bothata ba ho lokisa thepa.
Content
Foromo ea sebaka
Sebaka (S) sa bokaholimo ba cuboid se baloa ka tsela e latelang:
S = 2 (ab + bc + ac)
Foromo e fumanoa ka tsela e latelang:
- Lifahleho tsa "rectangular parallelepiped" li na le likhutlo tse 'nè,' me lifahleho tse fapaneng li lekana:
- metheo e mmedi: e nang le mahlakore a и b;
- mahlakore a mane: e nang le lehlakore a/b le bolelele c.
- Ho kenyelletsa libaka tsa lifahleho tsohle, tseo e 'ngoe le e' ngoe e lekanang le sehlahisoa sa mahlakore a bolelele bo fapaneng, re fumana: S = ab + ab + bc + bc + ac + ac = 2 (ab + bc + ac).
Mohlala oa bothata
Bala sebaka se ka holimo sa cuboid haeba ho tsejoa hore bolelele ba eona ke 6 cm, bophara ke 4 cm, le bolelele ba 7 cm.
Qeto:
Ha re sebeliseng foromo e kaholimo, re nkela litekanyetso tse tsebahalang ho eona:
S = 2 ⋅ (6 cm ⋅ 4 cm + 6 cm ⋅ 7 cm + 4 cm ⋅ 7 cm) = 188 cm2.