Kupeza dera la rectangular parallelepiped: chilinganizo ndi chitsanzo

M'buku lino, tiwona momwe tingawerengere malo a rectangular parallelepiped ndikusanthula chitsanzo cha kuthetsa vuto pokonza zinthu.

Area formula

Dera (S) la pamwamba pa cuboid limawerengedwa motere:

S = 2 (ab + bc + ac)

Fomula imapezedwa motere:

1. Nkhope za rectangular parallelepiped ndi makona anayi, ndipo nkhope zosiyana ndizofanana:
   • maziko awiri: okhala ndi mbali a и b;
   • mbali zinayi nkhope: ndi mbali ndi / b ndi wamtali c.
2. Powonjezera madera a nkhope zonse, iliyonse yomwe ili yofanana ndi mbali yautali wosiyana, timapeza: S = ab + ab + bc + bc + ac + ac = 2 (ab + bc + ac).

Chitsanzo cha vuto

Werengani pamwamba pa cuboid ngati imadziwika kuti kutalika kwake ndi 6 cm, m'lifupi ndi 4 cm, ndi kutalika ndi 7 cm.

Kusankha:

Tiyeni tigwiritse ntchito njira yomwe ili pamwambapa, ndikulowetsamo zomwe zimadziwika:

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