Video: Lub kaum sab nrauv theorem yog dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Lus Txhais & Formula. Lub kaum sab nrauv theorem hais tias lub kaum sab nrauv tsim thaum koj txuas rau sab ntawm a daim duab peb sab yog sib npaug rau cov lej ntawm nws cov ces kaum uas tsis nyob ib sab. Nco ntsoov, peb lub kaum sab xis uas tsis nyob ib sab yog cov uas tsis kov lub kaum sab xis uas peb ua haujlwm nrog.
Piv txwv li, lub sab nrauv lub kaum sab xis ntawm daim duab peb sab yog dab tsi?
Cov sab nrauv lub kaum sab xis theorem yog Proposition 1.16 hauv Euclid's Elements, uas hais tias qhov ntsuas ntawm ib qho sab nrauv lub kaum sab xis ntawm a daim duab peb sab yog ntau dua qhov kev ntsuas ntawm cov chaw taws teeb sab hauv lub kaum sab xis . Qhov no yog ib qho tseem ceeb tshwm sim nyob rau hauv geometry kiag li vim hais tias nws cov ntaub ntawv pov thawj tsis nyob ntawm lub parallel postulate.
Ib sab saum toj no, koj pom qhov ntsuas ntawm lub kaum sab xis li cas? Siv tus Protractor Txoj kev zoo tshaj plaws rau ntsuas ib lub kaum sab xis yog siv ib tug protractor. Txhawm rau ua qhov no, koj yuav pib los ntawm kab ib txoj kab hluav taws xob raws li 0-degree kab ntawm tus protractor. Tom qab ntawd, kab ntawm lub vertex nrog rau qhov nruab nrab ntawm tus protractor. Ua raws li txoj kab thib ob los txiav txim qhov lub kaum sab xis ntsuas mus rau qhov ze tshaj plaws.
Ib tug kuj yuav nug, ua li cas koj yuav nrhiav tau cov sum ntawm sab nrauv lub kaum sab xis ntawm ib daim duab peb sab?
Ib sab nrauv lub kaum sab xis ntawm a daim duab peb sab yog sib npaug rau cov sum ntawm qhov opposite sab hauv lub kaum sab xis . Yog xav paub ntxiv txog qhov no saib Daim duab peb sab sab nraud lub kaum sab xis theorem. Yog sib npaug lub kaum sab xis yog coj ntawm txhua vertex, lub sab nrauv cov ces kaum ib txwm ntxiv rau 360 ° Qhov tseeb, qhov no muaj tseeb rau txhua qhov convex polygon, tsis yog daim duab peb sab.
Lub kaum sab nrauv ntawm lub pentagon yog dab tsi?
Qhov suav ntawm sab nrauv cov ces kaum ntawm ib tug polygon yog 360 °. Cov mis rau xam qhov loj ntawm ib sab nrauv lub kaum sab xis yog: sab nrauv lub kaum sab xis ntawm ib tug polygon = 360 ÷ pes.
Pom zoo:
Koj ua pov thawj li cas ntawm cov ces kaum sab nrauv ntawm daim duab peb sab yog 360?
Lub kaum sab nrauv ntawm daim duab peb sab yog sib npaug rau qhov sib npaug ntawm cov kaum sab hauv sab nraud. Yog xav paub ntxiv txog qhov no saib Daim duab peb sab sab nraud lub kaum sab xis theorem. Yog tias lub kaum sib npaug raug coj los ntawm txhua qhov vertex, cov ces kaum sab nrauv ib txwm ntxiv rau 360 ° Qhov tseeb, qhov no muaj tseeb rau txhua qhov convex polygon, tsis yog daim duab peb sab
Dab tsi yog lub kaum sab nrauv ntawm lub quadrilateral?
Qhov sib npaug ntawm cov kaum sab nrauv ntawm quadrilaterals. Thaum ob sab ntawm lub quadrilaterals txuas ntxiv thiab cov ces kaum sab nrauv raug tsim. Qhov sib npaug ntawm plaub lub kaum sab nrauv yog ib txwm 360 degrees
Lub kaum sab nrauv ntawm lub voj voog yog dab tsi?
Lub kaum sab nrauv muaj nws qhov vertex qhov twg ob lub rays sib koom qhov kawg ntawm lub voj voog. Lub sab ntawm lub kaum sab xis yog ob lub rays. Kev ntsuas ntawm lub kaum sab nrauv yog pom los ntawm kev faib qhov sib txawv ntawm qhov ntsuas ntawm qhov cuam tshuam arcs los ntawm ob
Puas yog tib sab sab nrauv cov ces kaum ntxiv?
Ob lub kaum sab nrauv sab nrauv rau cov kab sib txuas thiab ntawm tib sab ntawm txoj kab transversal yog hu ua tib-sab sab nrauv cov ces kaum. Lub theorem hais tias tib lub sab sab nrauv cov ces kaum yog ntxiv, txhais tau tias lawv muaj qhov sib npaug ntawm 180 degrees
Dab tsi yog kev sib raug zoo ntawm sab nrauv thiab sab hauv lub kaum sab xis ntawm daim duab peb sab?
Cov kaum sab hauv yog hu ua Sab hauv cov ces kaum. Cov lej ntawm cov kaum sab hauv ntawm daim duab peb sab yog ib txwm 180 degrees. Lub kaum sab nrauv yog lub kaum sab xis ntawm ib sab ntawm ib qho duab, thiab ib txoj kab txuas ntxiv los ntawm sab tom ntej. Qhov sib npaug ntawm lub kaum sab nrauv thiab nws lub kaum sab hauv uas nyob ib sab kuj yog 180 degrees