Ma kēia paʻi ʻana, e noʻonoʻo mākou pehea e ʻike ai i ka radius o kahi pōʻai i hoʻopuni ʻia a puni ka cylinder ʻākau, a me kona ʻili a me ka nui o ka pōʻai i hoʻopaʻa ʻia e kēia pōʻai.
Ke ʻimi nei i ka radius o kahi pōʻai
Hiki ke wehewehe ʻia e pili ana i kekahi (a i ʻole, e hoʻokomo i ka cylinder i loko o ka pōpō) - akā hoʻokahi wale nō.
- ʻO ke kikowaena o ia pōʻai ke kikowaena o ka cylinder, i kā mākou hihia he kiko O.
- O1 и O2 ʻo ia nā kikowaena o nā kumu o ka cylinder.
- O1O2 – ke kiʻekiʻe o ka pahu (H).
- OO1 = OO2 = h/2.
Hiki ke ʻike ʻia ka radius o ka pōʻai puni (ʻO ʻOE PAHA), ka hapalua o ke kiekie o ke kinikini (OO1) a me ka radius o kona kumu (O1E) hana i huinakolu kupono OO1E.
Ma ka hoohana ana i keia, hiki ke imi i ka hypotenuse o keia huinakolu, oia hoi ka radius o ka poepoe i hoopuniia e pili ana i ke kinikini i haawiia:
I ka ʻike ʻana i ka radius o ka pōʻai, hiki iā ʻoe ke helu i ka ʻāpana (S) kona ili a me ka leo (V) pōʻai i kaupalena ʻia e kahi pōʻai:
- S = 4 ⋅ π ⋅ R2
- S= 4/3 ⋅ π ⋅ R3
'Ōlelo Aʻo: π ua like ia me 3,14.