Daim duab peb sab yog ib qho ntawm cov duab yooj yim ntawm cov phiaj xwm. Nws yog nrog nws tias txoj kev kawm ntawm qhov tseeb, hauv kev nkag siab, geometry pib hauv tsev kawm ntawv cov ntaub ntawv kawm. Nyob ntawm seb hom kaum, hom duab no tuaj yeem muab faib ua ntau hom. Thaum daws teeb meem, cov duab plaub feem ntau suav hais tias yog qhov yooj yim tshaj plaws. Rau nws, muaj ntau lub theorems, cov cai, nrog rau cov kev ua haujlwm trigonometric uas tso cai rau koj pom ib ceg lossis hypotenuse, paub tsuas yog qhov ntev ntawm ib sab thiab lub kaum sab xis (ib qho twg tsuas yog rau qhov yog).
Txawm li cas los xij, yog tias tsuas muaj daim duab peb sab no xwb, lub neej ntawm cov tub ntxhais kawm theem nrab thiab theem siab yuav yooj yim dua thiab tsis muaj kev txhawj xeeb. Tab sis nws tsis yog. Txhua daim duab uas kawm geometry muaj nws tus yam ntxwv thiab cov khoom. Yuav kom daws tau cov teeb meem muaj kev ntseeg siab, koj yuav tsum paub cov khoom ntawm txhua tus polygons.
Isosceles daim duab peb sab: nws yog dab tsi thiab nws noj nrog dab tsi?
Daim duab peb sab isosceles zoo ib yam li qhov nyiam ntawm Pythagoras, uas tau hais hauv kev taw qhia. Txawm tias ib tug kawm qib tsib yuav nkag siab txog cov kev cai uas cuam tshuam txog nws txoj kev tsim kho lossis nrhiav tsis tau cov ntsiab lus. Qhov tseem ceeb -ua tau zoo versed nyob rau hauv lub hauv paus ntsiab lus ntawm geometry thiab cov ntsiab lus ntawm cov duab tiaj tus.
Cov khoom ntawm daim duab peb sab isosceles tawm ntawm nws cov qauv. Ob lub kaum sab xis ntawm lub hauv paus ntawm xws li ib tug polygon yog tib yam, zoo li yog ob sab. Tam sim ntawd los ntawm cov ntaub ntawv no, koj tuaj yeem kos cov lus xaus. Yuav kom nrhiav tau cov degree ntsuas ntawm sab saum toj, paub txog ib qho ntawm cov ces kaum ntawm lub hauv paus, koj yuav tsum muab nws los ntawm ob thiab rho tawm los ntawm 180 °. Ob sab, cov ntsiab lus siab uas nyob rau saum toj thiab ntawm lub hauv paus, hu ua sab.
Basic khoom ntawm daim duab peb sab isosceles
Txoj cai, yog li, daim duab no tsis muaj - txhua yam hauv cov haujlwm yog los ntawm kev tsim kho, ua kom nkag siab thiab yooj yim rau cov tub ntxhais kawm. Txawm li cas los xij, muaj ib qho tseem ceeb uas tuaj yeem hu ua cov cuab yeej ntawm qhov nruab nrab ntawm daim duab peb sab isosceles. Nws yog txhua yam hais txog nws ob qhov xwm txheej. Yog tias koj tsim ib daim duab peb sab ntawm daim ntawv raws li tag nrho cov cai, koj yuav pom tias cov kab hauv nruab nrab tsis yog qhov nruab nrab xwb, tab sis kuj yog qhov siab thiab bisector.
Median hauv daim duab peb sab isosceles
Txoj kab ncaj nraim los ntawm sab saum toj mus rau hauv qab yuav tsis muaj qhov tsis meej. Nws cov khoom yog txiav txim siab los ntawm cov yam ntxwv tseem ceeb ntawm daim duab peb sab isosceles. Txo los ntawm lub ces kaum ntawm sab saum toj mus rau lub hauv paus, nws tsim ob daim duab peb sab sib npaug zos, thiab ua ib tug perpendicular nrog lub hauv paus, uas faib nws mus rau hauv sib npaug segments. Tsis txhob cuam tshuam cov duab peb sab no nrog cov sib npaug (qhov yuam kev no feem ntau ua los ntawm cov tub ntxhais kawm). Lawv muaj peb lub ces kaum zoo ib yam, tsis yog ob tug zoo li no.
