Lub tswv yim tseem ceeb hauv geometry raws li kev tshawb fawb yog qhov zoo sib xws ntawm cov duab. Kev paub txog cov cuab yeej no tso cai rau koj los daws cov teeb meem loj heev, suav nrog hauv lub neej tiag tiag.
Txoj kev xav
Cov duab zoo sib xws yog cov uas tuaj yeem hloov mus rau ib leeg los ntawm kev muab txhua sab los ntawm qee qhov coefficient. Hauv qhov no, cov ces kaum sib thooj yuav tsum sib npaug.
Cia peb xav txog cov ntsiab lus nthuav dav ntawm qhov zoo sib xws ntawm daim duab peb sab. Tag nrho, muaj peb txoj cai uas tso cai rau peb lees paub tias cov nuj nqis no muaj cov cuab yeej no.
thawj qhov kev ntsuas rau qhov zoo sib xws ntawm daim duab peb sab xav kom ob khub ntawm cov ces kaum sib npaug.
Raws li txoj cai thib ob, cov lej suav suav suav tias zoo ib yam thaum ob sab ntawm ib qho sib npaug rau cov ntu sib txuas ntawm lwm qhov. Tib lub sijhawm, cov ces kaum uas tsim los ntawm lawv yuav tsum sib npaug.
Thiab, thaum kawg, kos npe thib peb: daim duab peb sab zoo ib yam yog tias tag nrho lawv sab yog qhov sib npaug.
Muaj cov duab uas, raws li qee yam khoom, tuaj yeem faib ua hom tshwj xeeb (sib npaug, isosceles, duab plaub). Rauhais tias cov duab peb sab zoo sib xws yuav tsum muaj tsawg dua kom tau raws li. Piv txwv li, peb yuav xav txog cov cim ntawm qhov zoo sib xws ntawm cov duab plaub
triangles:
- lub hypotenuse thiab ib tug ntawm ob txhais ceg ntawm ib tug yog proportional rau tus coj sab ntawm lwm tus;
- txhua lub kaum sab xis ntawm ib daim duab yog sib npaug rau qhov sib npaug ntawm lwm tus.
Yog tias pom cov cim zoo sib xws ntawm daim duab peb sab, cov khoom hauv qab no tshwm sim:
- qhov piv ntawm lawv cov kab sib txuas (tus nruab nrab, bisectors, heights, perimeters) yog sib npaug rau qhov sib npaug coefficient;
- yog tias peb pom qhov tshwm sim ntawm kev faib cov cheeb tsam, peb tau qhov square ntawm tus lej no.
Daim ntawv thov
Cov khoom suav hais tias tso cai daws cov teeb meem geometric ntau heev. Lawv tau siv dav hauv lub neej txhua hnub. Paub txog cov cim ntawm qhov zoo sib xws ntawm daim duab peb sab, koj tuaj yeem txiav txim siab qhov siab ntawm ib qho khoom lossis xam qhov kev ncua deb mus rau qhov chaw nkag tsis tau.
Yuav kom paub, piv txwv li, qhov siab ntawm tsob ntoo, ib tug ncej yog teem nruj nreem vertically ntawm ib tug pre-raug ntsuas, nyob rau hauv uas ib tug rotating bar yog tsau. Nws yog taw qhia rau sab saum toj ntawm cov khoom thiab khij qhov taw tes rau hauv av uas txoj kab txuas ntxiv nws yuav hla cov kab rov tav. Peb tau txais cov duab peb sab zoo sib xws. Los ntawm kev ntsuas qhov deb ntawm qhov taw tes mus rau tus ncej, thiab tom qab ntawd mus rau qhov khoom, peb pom qhov sib xws coefficient. Paub qhov siab ntawm tus ncej, koj tuaj yeem yooj yim xam qhov tib yam tsis muaj rau tsob ntoo.
Nyob qhov deb ntawm oblos ntawm cov ntsiab lus ntawm thaj av peb xaiv ib qho ntxiv ntawm lub dav hlau. Tom qab ntawd peb ntsuas qhov kev ncua deb ntawm nws mus rau qhov siv tau. Peb txuas tag nrho cov ntsiab lus hauv av thiab ntsuas cov kaum sab xis uas nyob ib sab ntawm qhov paub. Tau tsim ib daim duab peb sab zoo sib xws rau ntawm daim ntawv thiab txiav txim siab qhov sib piv ntawm ob sab ntawm ob daim duab, peb tuaj yeem xam qhov nrug ntawm cov ntsiab lus yooj yim.
Yog li, cov cim ntawm qhov zoo sib xws ntawm daim duab peb sab yog ib lub ntsiab lus tseem ceeb ntawm geometry. Nws yog dav siv tsis tsuas yog rau kev tshawb fawb, tab sis kuj rau lwm yam kev xav tau.
