Ma kēia hoʻolaha, e noʻonoʻo mākou i ka wehewehe, nā mea nui a me nā ʻano o kekahi o nā ʻano maʻamau i ka lewa - he cone. Hoʻopili ʻia ka ʻike i hōʻike ʻia me nā kiʻi kūpono no ka ʻike maikaʻi ʻana.
Ka wehewehe o ka cone
A laila, e noʻonoʻo mākou i ke ʻano maʻamau o ka cone - pōʻai pololei. Ua helu ʻia nā ʻano ʻokoʻa ʻē aʻe o ke kiʻi ma ka ʻāpana hope o ka paʻi.
No laila, cone pōʻai pololei – He kiʻi geometric ʻekolu-dimensional kēia i loaʻa ma ka hoʻohuli ʻana i kahi huinakolu ʻākau a puni kekahi o kona mau wāwae, ʻo ia ke koʻi o ke kiʻi. I ka nānā ʻana i kēia, kapa ʻia kēlā ʻano cone i kekahi manawa cone o ke kipi.
Loaʻa ka cone ma ke kiʻi ma luna ma muli o ka hoʻololi ʻana o kahi huinakolu ʻākau CDA (ai ole BCD) a puni ka wāwae CD.
ʻO nā mea nui o ka cone
- R ʻo ia ka radius o ka pōʻai kumu cone. He kiko ke kikowaena o ka pōʻai D, anawaena – māhele AB.
- h (CD) – ke kiʻekiʻe o ka cone, ʻo ia ka axis o ke kiʻi a me ka wāwae o nā huinakolu ʻākau CDA or BCD.
- Point C – ka piko o ka cone.
- l (CA, CB, CL и CM) nā mea hana o ka cone; he mau ʻāpana kēia e hoʻopili ana i ka piko o ka cone me nā kiko ma ke anapuni o kona kumu.
- ʻāpana axial o ka cone he huinakolu isosceles ABC, i hana ʻia ma muli o ka hui ʻana o ka cone e kahi mokulele e hele ana ma kona axis.
- ʻili cone – aia kona ʻaoʻao ʻaoʻao a me kona kumu. Hōʻike ʻia nā ʻōkuhi no ka helu ʻana, a me ka cone pōʻai ʻākau ma nā puke ʻokoʻa.
Aia ka pilina ma waena o ka generatrix o ka cone, kona kiʻekiʻe a me ka radius o ke kumu (e like me):
l2 =h2 + R2
ʻO ke cone nānā - ka ʻaoʻao ʻaoʻao o ka cone, i kau ʻia ma kahi mokulele; he mahele puni.
- ua like ia me ke anapuni o ke kumu o ka cone (ie 2πR);
- α - kahi kihi kahiki (a i ʻole ke kikowaena waena);
- l ʻo ia ka radius lālā.
'Ōlelo Aʻo: Ua nānā mākou i nā mea nui ma kahi paʻi kaʻawale.
Nā ʻano cones
- cone pololei - loaʻa kahi kumu like ʻole. ʻO ke kuhi ʻana o ka piko o kēia kiʻi ma luna o ka mokulele kumu e kūlike me ke kikowaena o kēia kumu.
- Oblique (oblique) cone – ʻaʻole kū like ke kuhi ʻana o ka piko o ke kiʻi ma kona kumu me ke kikowaena o kēia kumu.
- (papa conical) – ka ʻāpana o ka cone i koe ma waena o kona kumu a me ka mokulele ʻoki e like me ke kumu i hāʻawi ʻia.
- cone pōʻai He pōʻai ke kumu o ke kiʻi. Aia kekahi: elliptic, parabolic a me hyperbolic cones.
- cone kaulike – he cone pololei, ua like ka generatrix me ke anawaena o kona kumu.
