Video: Euclid txhais ib kab li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Thaum geometry thawj zaug formalized los ntawm Euclid hauv cov Elements, nws txhais ib tug general kab (ncaj los yog nkhaus) ua "breadthless length" nrog ib tug ncaj kab ua a kab "uas lies sib npaug nrog cov ntsiab lus ntawm nws tus kheej". Hauv ob qhov loj me, i.e., lub Euclidean dav hlau, ob kab uas ua tsis sib tshuam yog hu ua parallel.
Tom qab ntawd, ib tug kuj yuav nug, dab tsi yog lub ntsiab lus ntawm Euclid?
Euclid , ib fl. 300 BC, tseem hu ua Euclid ntawm Alexandria, yog ib tug Greek lej, feem ntau hu ua "Leej Txiv ntawm Geometry". " Euclid "yog lub anglicized version ntawm Greek lub npe Ε?κλείδης, lub ntsiab lus "Zoo Siab Kawg".
Ib yam li ntawd, koj txhais kab li cas? A kab txhais tau tias yog a kab ntawm cov ntsiab lus uas nthuav infinitely nyob rau hauv ob txoj kev. Nws muaj ib qhov ntev, ntev. Cov ntsiab lus uas nyob rau tib yam kab hu ua collinear point. A kab yog txhais los ntawm ob lub ntsiab lus thiab yog sau raws li qhia hauv qab no nrog ib tug xub taub hau.
Kuj nug, dab tsi yog lub ntsiab lus ntawm kab hauv lej?
A kab yog ib tug ncaj ib-dimensional daim duab uas tsis muaj thickness thiab extending infinitely nyob rau hauv ob qho tib si cov lus qhia. A kab qee zaum hu ua ncaj kab los yog, ntau archaically, ib txoj cai kab (Casey 1893), kom qhia meej tias nws tsis muaj "wiggles" nyob qhov twg raws nws qhov ntev.
Kab thiab hom kab yog dab tsi?
Muaj plaub hom kab : kab rov tav kab , ntsug kab , perpendicular, thiab parallel kab . Lawv raug txhais raws li lawv txoj kev taw qhia, thiab cov ces kaum yog tias muaj, tsim ntawm lawv. Cia wb mus saib lawv ib leeg.
Pom zoo:
Dab tsi yog qhov txawv ntawm kab rau kab voltage thiab kab rau nruab nrab voltage?
Qhov voltage ntawm ob kab (piv txwv li 'L1' thiab 'L2') yog hu ua kab rau kab (los yog theem rau theem) voltage. Qhov voltage hla txhua qhov winding (piv txwv li ntawm 'L1' thiab 'N' yog hu ua kab rau nruab nrab (lossis theem voltage)
Txoj kab hauv kab lus dab tsi txhais li cas?
Scatter plots zoo ib yam li kab graphs uas lawv siv kab rov tav thiab ntsug axes rau cov ntaub ntawv cov ntsiab lus. Yog tias cov kab mus los ntawm tus nqi siab ntawm y-axis mus rau qhov muaj txiaj ntsig siab ntawm x-axis, qhov sib txawv muaj qhov tsis zoo. Kev sib raug zoo zoo tag nrho yog muab tus nqi ntawm 1
Nws puas yuav ua rau pom qhov sib npaug ntawm kab sib npaug mus rau ib kab thiab los ntawm ib qho taw tes ntawm kab?
Qhov sib npaug ntawm ib kab uas yog parallel lossis perpendicular rau ib kab? Cov lus teb tau: Cov nqes hav ntawm cov kab sib npaug sib npaug. Hloov txoj kab nqes paub thiab cov kev sib koom ua ke ntawm ib qho taw tes ntawm lwm txoj kab rau hauv daim ntawv point-slope kom pom qhov sib npaug ntawm kab sib npaug
Vim li cas txoj kab kab rov tav muaj txoj kab nqes ntawm 0?
Mathwords: Zero Slope. Txoj kab nqes ntawm kab rov tav. Kab rov tav kab muaj nqes 0 vim tias tag nrho nws cov ntsiab lus muaj tib y-coordinate. Yog li ntawd, tus qauv siv rau txoj kab nqes ntsuas rau 0
Puas yog kab rov tav txoj kab nqes 0 lossis tsis tau txhais?
Ib yam li 'Z' (nrog nws ob kab kab rov tav) tsis zoo ib yam li 'N' (nrog nws ob txoj kab ntsug), yog li 'Xoom' txoj kab nqes (rau kab kab rov tav) tsis zoo ib yam li 'Tsis yog' txoj kab nqes (rau kab ntsug). Tus naj npawb 'zero' tshwm sim, yog li kab rov tav muaj tseeb muaj txoj kab nqes