Lub kaum sab nrauv theorem yog dab tsi?
Lub kaum sab nrauv theorem yog dab tsi?

Video: Lub kaum sab nrauv theorem yog dab tsi?

Video: Lub kaum sab nrauv theorem yog dab tsi?
Video: Qhia xaws lub tsho hnav tuaj sab nrauv daim 2 2024, Kaum ib hlis
Anonim

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.

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