Helitaanka aagga leydi-geeska ah ee barbar socda: caanaha iyo tusaalaha

Daabacaaddan, waxaan tixgelin doonaa sida loo xisaabiyo bedka dusha leydi-geeska ah ee barbar socda oo aan falanqeyno tusaale xallinta dhibaatada hagaajinta shay.

Habka deegaanka

Bedka (S) ee dusha sare ee cuboid waxaa loo xisaabiyaa sida soo socota:

S = 2 (ab + bc + ac)

Qaaciddada waxaa loo helay sida soo socota:

1. Wajiyada leydi-geeska ah ee barbar socda waa leydi, wejiyada iska soo horjeedana waa isku siman yihiin:
   • laba saldhig: oo leh dhinacyo a и b;
   • afar weji: dhinac leh a/b oo dheer c.
2. Ku darida aagagga wejiyada oo dhan, mid kasta oo ka mid ah kuwaas oo la mid ah sheyga dhinacyada dhererka kala duwan, waxaan helnaa: S = ab + ab + bc + bc + ac + ac = 2 (ab + bc + ac).

Tusaale dhibaato

Xisaabi bedka dusha sare ee cuboid haddii la og yahay in dhererkiisu yahay 6 cm, ballaciisu yahay 4 cm, dhererkuna yahay 7 cm.

Go'aanka:

Aynu isticmaalno qaacidada sare, annagoo ku beddelayna qiyamka la yaqaan:

S = 2 ⋅ (6 cm ⋅ 4 cm + 6 cm ⋅ 7 cm + 4 cm ⋅ 7 cm ) = 188 cm².