Kev suav ntawm thaj chaw ntawm cov yeeb nkab cap feem ntau suav nrog thaj chaw hauv qab thiab thaj chaw. Ntawm no yog cov ncauj lus kom ntxaws kev xam txheej txheem:
Xam cov hauv paus cheeb tsam:
Hauv qab ntawm lub raj nplaim hluav taws xob feem ntau yog cov khoom noj hauv qab, yog li thaj chaw rau thaj tsam rau thaj tsam ntawm lub voj voog: s} π * r2, qhov twg r yog lub vojvoog ntawm lub voj voog.
Xam thaj chaw:
Thaj chaw ib sab tuaj yeem suav nrog siv cov qauv rau sab ntawm lub tog raj kheej, tab sis nws yuav tsum tau sau tseg tias sab nrauv thiab tsis suav nrog lub dav hlau nkhaus. Cov mis rau sab thaj yog: Cheeb Tsam {{2/} {} {}= {2} Lub qhov siab ntawm cov yeeb nkab cap (tseem hu ua "qhov siab" ntawm qhov chaw).
Xam tag nrho cheeb tsam:
Tag nrho cheeb tsam ntawm cov yeeb nkab hluav taws xob yog qhov suav ntawm thaj chaw thiab thaj chaw: Tag nrho}} Π * r * h.
Hauv kev siv cov ntawv thov, koj yuav tsum xam thaj chaw ntawm cov raj cap raws qee qhov ntev xws li rterius r thiab qhov siab h. Piv txwv li, yog tias lub vojvoog ntawm lub raj nplaim hluav taws xob yog 6 chav nyob thiab qhov siab yog π} {} {{}} {} {} {} {}} Π
Ib qho ntxiv, yog tias cov duab lossis qhov loj me ntawm cov yeeb nkab hluav taws xob muaj cov nta tshwj xeeb (tsis yog} Cov txheej txheem nyob hauv ntej, thiab lwm yam. Hauv qhov no, nws raug nquahu kom ua cov kev suav haum raws li cov duab geometric thiab qhov ntev.