Qhov twg yog txoj hauv kev los sau lub dav hlau?

2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36

Ib lub ntsiab lus yog sau npe siv tsab ntawv loj. Ib kab tuaj yeem ua tau sau npe siv ob lub ntsiab lus ntawm kab. A dav hlau tuaj yeem yog sau npe siv peb lub ntsiab lus ntawm dav hlau . Ob lossis ntau lub ntsiab lus tau hais tias yog collinear yog tias cov ntsiab lus nyob ntawm tib kab.

Kuj nug, ua li cas koj sau lub dav hlau hauv geometry?

A dav hlau extends infinitely nyob rau hauv ob qhov ntev. Nws tsis muaj thickness. Ib qho piv txwv ntawm a dav hlau yog ib qho kev sib koom tes dav hlau . A dav hlau yog npe los ntawm peb lub ntsiab lus nyob rau hauv lub dav hlau uas tsis nyob rau tib kab.

Ib yam li ntawd, txoj kab perpendicular yog dab tsi? Hauv elementary geometry, cov cuab yeej ntawm kev ua perpendicular (perpendicularity) yog kev sib raug zoo ntawm ob kab uas sib ntsib ntawm lub kaum sab xis (90 degrees). A kab yog hais tias yog perpendicular rau lwm tus kab yog ob tug kab sib tshuam ntawm lub kaum sab xis.

Ib yam li ntawd, koj puas tuaj yeem sau lub dav hlau nrog plaub lub ntsiab lus?

9. Lub npe collinear thiab coplanar cov ntsiab lus Collinear cov ntsiab lus yog ob lossis peb cov ntsiab lus ntawm tib kab. Collinear cov ntsiab lus A, B, C thiab cov ntsiab lus D, B, E Fig. 2 A B C Coplanar cov ntsiab lus yog plaub los yog ntau dua taw tes rau taw tes ntawm tib yam dav hlau.

Lub dav hlau P thiab Q sib tshuam pes tsawg zaus?

Plane P thiab Q ntawm no ncuav mog qab zib sib tshuam tsuas yog ib zaug hauv kab m. Postulate 2.7 hais tias yog ob dav hlau sib tshuam , ces lawv kev sib tshuam yog kab.