Mākou e huli i ka wahi o ka pahu

O ka ai iiiaanoaa o geometric kinona o kekahi o ka simplest i ke'ōleloʻia parallelepiped. Ka mea, i ke kinona o ka prism kona kumu o ke parallelogram. Ia mea,ʻaʻole paʻakikī e hoʻomaulia i ka wahi o ka pahu, no ka mea, o ka haʻilula ka loa mea.

Prism e maka, vertices a me nā lua penei. Ka puunaue ana o kēia mau constituent hehee wale, ua māʻona ina ka palena iki dala i mea e pono ai no ka ho okumu ana o ka geometric shape. Parallelepiped he 6 maka, a i pili e vertices 8 a me 12 iwi aoao. A me ka mea ku ponoʻaoʻao o ka pahu, e mau loa ana e like. No laila, e huli i ka pahu āpana, ia mea lawa paha kana e hooholo i ka nui o kona maka ekolu.

Parallelepiped (i ka makahiki 'o ia hoʻi "laua maka" ma ka Helene,' ōlelo) i kekahi waiwai i hiki ke'ōleloʻia. Mua, i ka symmetry o ka huahelu ua hoʻopaʻa wale i loko o ka waena o kēlā me kēia o kona diagonals. Ka lua, me ka ma waena o kekahi o kona e ku pono diagonal vertices, he mea hiki, e huai ae i na aka wahi a pau i he hookahi wahi o ke kuʻina. I ke kumukuai o 'ana i kumumanaʻo o ka waiwai i ka mea ku pono i lalo ke alo i mau, a pono e laua i kekahi i kekahi.

Ma ke ano maoli, i kēia mau? Ueo i kūlana parallelepipeds:

• mau huinahń - ka mea, he o na maka o kekahi mau huinahń shape;

• kauoha - ua wale i kaʻaoʻao maka o ka huinahń loa;

• kēlā parallelepiped mea he hapa o kaʻaoʻao maka, a i haawi ole-÷ haku hana pololei;

• Kupa - he o ka huinahalike-hoʻokino i lalo ke alo.

E ka ho'āʻo e huli i ka wahi o ka pahu ma ke kumu hoohalike o ke huinahńʻano o ka shape. E like me ka makou i ike ai mamua, o ka maka a pau huinahń loa. A no ka mea, ua hoemi ia i eono ka nui o kēia mau kumu mua, a laila, e wehe aʻe i ka wahi o kēlā me kēia maka, e pono e helu i ke kiʻi i ka hopena i loko o ka hoʻokahi helu. A e loaʻa i ka wahi o kela a me keia o ia mea,ʻaʻole paʻakikī. E hana i kēia, e hoonui i ka aoao elua o ka rectangle.

Hoʻohana 'ia ka makemakika haʻilula e hooholo i ka wahi o ka cuboid. Ua ninoieo o ka loa nui huapalapala denoting maka wahi, a me ka mea like penei: S = 2 (ab + BC + AC), kahi S - wahi o ka huahelu, he, b. -ʻaoʻao o ka waihona ipu, e - kīloi paʻewa lihi.

Mākou e hāʻawi aku i ka ino i ka ho omaulia. Lawe, he = 20 knm, e = 16 knm, e = 10 knm e pono e hoonui i ka nui i like me ka haʻilula :. 20 * 16 + 16 * 10 + 20 * 10, a loaa i ka helu o ka 680 cm2. Akā, ka mea, e ia wale nō ka hapalua o ka huahelu, e like me mākou i aʻo, a hōʻuluʻulu i nā kuea maka ekolu. No kēlā me kēia maka i kona "papalua", e ka palua ana o ka kūpono waiwai, a kiʻi i ka pahu āpana like i ka 1360 knm 2.

No ka ho omaulia i ke kīloi paʻewaʻilikai wahi, pili i ka haʻilula S = 2c (i + b). hiki ke loaʻa ma ka hoonui i ka lōʻihi o nāʻaoʻao o ka waihona ipu ma kēlā me kēia 'ē aʻe o ka wahi o ka pahu waihona ipu.

I ka maʻamau o ke ola, parallelepipeds hiki ke loaʻa pinepine ia. About lākou kū i ka nani a mākou i ke kinona o nā pōhaku lepo, laau poe huki o kona päkaukau, he maʻamau matchbox. Ano he kumu hoʻohālike o kela mea keia mea hiki ke loaʻa ma ka nui loa a puni mākou. School papahana ma ka anahonua i ka hoʻopaʻa 'ana i kekahi mau aʻo haawi ai i ka pahu. Ka mua o kēia mau ana hoʻohālike hōʻike he cuboid. A laila, e hōʻike i nā haumāna pehea e komo i loko o ia i ka mea poepoe a me ka pyramid, nā huahelu, e imi i ka wahi o ka pahu. Ma pōkole, keia mea i ka simplest ekolu-dimensional huahelu.