Zaj lus no nrov piav qhia yuav ua li cas thiaj nrhiav tau lub vojvoog ntawm lub voj voog uas sau rau hauv ib lub xwmfab. Cov ntaub ntawv theoretical yuav pab koj nkag siab tag nrho cov nuances ntsig txog lub ncauj lus. Tom qab nyeem cov ntawv no, koj tuaj yeem daws cov teeb meem zoo sib xws yav tom ntej.
Basic Theory
Ua ntej koj mus ncaj qha mus nrhiav lub vojvoog ntawm lub voj voog uas sau rau hauv ib lub xwmfab, koj yuav tsum paub koj tus kheej nrog qee cov ntsiab lus tseem ceeb. Tej zaum lawv yuav zoo li yooj yim heev thiab pom tseeb, tab sis lawv yuav tsum nkag siab qhov teeb meem.
Ib square yog plaub fab, txhua sab ntawm qhov sib npaug ntawm ib leeg, thiab qhov ntsuas ntawm txhua lub kaum sab xis yog 90 degrees.
Vajvoog yog ob-seem kaw nkhaus nyob ntawm qhov deb ntawm qee qhov taw tes. Ib ntu, ib qho kawg uas nyob hauv nruab nrab ntawm lub voj voog, thiab lwm qhov kawg nyob ntawm ib qho ntawm nws qhov chaw, hu ua lub vojvoog.
Paub cov ntsiab lus, tsuas yog lo lus nug tseem ceeb tseem nyob. Peb yuav tsum nrhiav lub vojvoog ntawm lub voj voog inscribed nyob rau hauv ib lub square. Tab sis kab lus kawg txhais li cas? Tsis muaj dab tsi nyob ntawm no thiab.complex. Yog hais tias tag nrho cov sab ntawm ib tug tej yam polygon kov ib tug nkhaus kab, ces nws yog suav tias yog inscribed nyob rau hauv no polygon.
Radius ntawm lub voj voog sau nyob rau hauv ib square
Cov khoom siv theoretical dhau lawm. Tam sim no peb yuav tsum xav txog yuav ua li cas muab tso rau hauv kev xyaum. Cia peb siv daim duab no.
Lub vojvoog yog pom tseeb nyob rau ntawm AB. Qhov no txhais tau hais tias nyob rau tib lub sij hawm nws yog parallel rau AD thiab BC. Hais lus ntxhib, koj tuaj yeem "overlay" nws ntawm sab ntawm lub xwmfab txhawm rau txiav txim siab qhov ntev. Raws li koj tau pom, nws yuav sib haum mus rau ntu BK.
Ib qho ntawm nws qhov kawg r nyob hauv nruab nrab ntawm lub voj voog, uas yog qhov sib tshuam ntawm kab pheeb ces kaum. Lub tom kawg, raws li ib qho ntawm lawv cov khoom, faib ib nrab ntawm ib nrab. Siv lub Pythagorean theorem, koj tuaj yeem ua pov thawj tias lawv kuj faib sab ntawm daim duab ua ob qhov zoo tib yam.
Txais cov lus sib cav no, peb xaus:
r=1/2 × a.
