Video: Puas yog lub oval yog ob sab?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Hauv kev hais lus, " oval "hais tias a puab zoo li lub qe los yog ib qho ellipse , uas tej zaum yuav ob - qhov seem los yog peb- qhov seem . Nws kuj feem ntau hais txog a daim duab uas zoo li ob semicircles koom los ntawm ib daim duab plaub, zoo li kab civliv infield, ceev skating rink lossis kis las kis las.
Yog li ntawd, oval yog ib qho zoo li qub?
Hauv zaj lus qhia no, koj kawm tau tias ib qho oval yog a puab uas zoo li daim ntawv lossis cov qauv ntawm lub qe. Koj kuj kawm tau li ntawd, zoo ib yam nkaus cov duab , ib oval muaj cov khoom, xws li lub ntsej muag, tab sis tsis muaj ob sab lossis fab. Cov duab oval nyob ib ncig ntawm peb, txawm nyob hauv peb tsev.
Tsis tas li ntawd, qhov twg yog ob qhov loj me lossis cov duab tiaj tus? Hauv geometry, a ob - qhov loj me tuaj yeem txhais tau tias yog a tiaj tus dav hlau daim duab los yog a puab uas muaj ob qhov ntev - ntev thiab dav. Ob - qhov seem los yog 2 -D cov duab tsis muaj qhov tuab thiab tuaj yeem ntsuas hauv nkaus xwb ob ntsej muag.
Ib yam li ntawd, puas yog lub trapezoid yog ob qhov loj me?
Piv txwv li, lub quadrilateral zoo tshaj plaws approximating lub voj voog yog lub square. Lub xwmfab tuaj yeem txav los ntawm lwm txoj kev. Pib nrog ib lub quadrilateral uas muaj tsawg kawg yog ib khub ntawm qhov sib luag. Qhov no daim duab npe a trapezoid.
Dab tsi yog qhov 2 seem duab?
Txhais. A puab uas tsuas muaj ob qhov ntev (xws li qhov dav thiab qhov siab) thiab tsis muaj thickness. Squares, Vajvoog, Daim duab peb sab, Hexagon, Rhombus thiab lwm yam yog ob qhov seem khoom. Kuj tseem hu ua "2D".
Pom zoo:
Koj tuaj yeem ua pov thawj li cas 2 daim duab peb sab zoo sib xws siv lub kaum sab xis sab SAS zoo sib xws postulate?
SAS Similarity Theorem hais tias yog ob sab hauv ib daim duab peb sab yog proportional rau ob sab hauv lwm daim duab peb sab thiab lub kaum sab xis nyob rau hauv ob qho tib si congruent, ces ob daim duab peb sab zoo ib yam. Ib qho kev hloov pauv zoo sib xws yog ib lossis ntau qhov kev hloov pauv tsis tu ncua ua raws li kev dilation
Vim li cas nws thiaj li hais tias lub Orthocenter ntawm daim duab peb sab obtuse yuav tsum nyob rau sab nraud ntawm daim duab peb sab?
Nws hloov tawm tias tag nrho peb qhov siab ib txwm sib tshuam ntawm tib lub ntsiab lus - lub npe hu ua orthocenter ntawm daim duab peb sab. Lub orthocenter tsis yog ib txwm nyob hauv daim duab peb sab. Yog tias daim duab peb sab yog obtuse, nws yuav nyob sab nraud. Txhawm rau ua kom qhov no tshwm sim cov kab qhov siab yuav tsum tau txuas ntxiv kom lawv hla
Puas yog lub kaum sab xis sab congruent?
Lub Side Angle Side postulate (feem ntau abbreviated li SAS) hais tias yog ob sab thiab lub kaum sab xis ntawm ib daim duab peb sab yog congruent rau ob sab thiab lub kaum sab xis ntawm lwm daim duab peb sab, ces ob daim duab peb sab yog congruent
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
Puas yog daim duab peb sab isosceles muaj ob lub kaum sab xis?
Thaum ib daim duab peb sab muaj ob sab congruent nws hu ua daim duab peb sab isosceles. Lub kaum sab xis ntawm ob sab ntawm tib qhov ntev yog congruent. Ib daim duab peb sab uas tsis muaj ib sab lossis cov kaum sab xis yog hu ua daim duab peb sab scalene