Video: Lub npe rau pawg Quadrilaterals yog dab tsi rau cov plaub lub kaum sab xis yog 90?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Nws yog "niam txiv" ntawm lwm tus quadrilaterals , uas tau txais los ntawm kev ntxiv kev txwv ntawm ntau yam: Ib daim duab plaub yog ib qho parallelogram tab sis nrog tag nrho plaub sab hauv lub kaum sab xis tsau ntawm 90 ° Ib lub rhombus yog parallelogram tab sis nrog tag nrho plaub sab sib npaug ntawm qhov ntev.
Tsuas yog li ntawd, puas yog ib lub quadrilateral muaj 4 lub ces kaum uas yog 90?
Ib daim duab plaub yog ib hom quadrilateral nrog plaub txoj cai lub kaum sab xis . Lub ntsiab txhais ntawm ib daim duab plaub yog ib daim duab nrog plaub sab thiab plaub txoj cai lub kaum sab xis . Qhov no txhais tau hais tias txhua lub kaum sab xis hauv ib daim duab plaub 90 qib. Lwm cov cuab yeej ntawm ib daim duab plaub yog tias cov sab nraud yog sib npaug rau ib leeg thiab sib npaug ntawm qhov ntev.
Qhov thib ob, hom plaub fab twg ib txwm muaj 4 lub kaum sab xis?
| Lub npe Quadrilateral | Kev piav qhia |
|---|---|
| Daim duab plaub | 2 khub ntawm parallel sab. 4 lub kaum sab xis (90 °). Cov sab nraud yog sib npaug thiab sib npaug. Tag nrho cov ces kaum yog congruent. |
| Square | 4 sib sib zog nqus. 4 lub kaum sab xis (90 °). Cov sab nraud yog sib npaug. Txhua lub kaum sab xis yog congruent. |
| Trapezoid | Tsuas yog ib khub ntawm opposite sab yog parallel. |
Ib tug kuj yuav nug, dab tsi yog lub npe rau cov pab pawg ntawm Quadrilaterals rau leej twg tag nrho plaub sab yog sib npaug ntev thiab tsis muaj lwm yam kev txwv?
Hauv Euclidean geometry, kite yog a quadrilateral nws plaub sab tuaj yeem muab faib ua ob khub ntawm sib npaug - sab ntev uas nyob ib sab ntawm txhua tus lwm yam . Nyob rau hauv sib piv, ib tug parallelogram kuj muaj ob khub ntawm sib npaug - sab ntev , tab sis lawv yog opposite rau txhua tus lwm yam es tsis nyob ib sab.
Dab tsi yog 4 hom quadrilaterals?
A quadrilateral yog plaub-sided polygon nrog plaub lub kaum sab xis. Muaj ntau hom quadrilaterals . Qhov tsib feem ntau hom yog lub parallelogram, lub duab plaub, square, trapezoid, thiab rhombus.
Pom zoo:
Ib daim duab plaub puas muaj plaub lub kaum sab xis?
Ib daim duab plaub muaj ob khub ntawm qhov sib npaug ntawm qhov sib npaug, thiab plaub lub kaum sab xis. Nws kuj yog ib qho parallelogram, vim nws muaj ob khub ntawm qhov sib luag. Ib lub xwmfab muaj ob khub ntawm qhov sib npaug, plaub lub kaum sab xis, thiab tag nrho plaub sab sib npaug. Tsis yog, vim lub rhombus tsis tas yuav tsum muaj 4 lub kaum sab xis
Cov kab lus hloov sab hauv cov ces kaum piav qhia txoj haujlwm ntawm ob lub kaum sab xis li cas?
Hloov sab hauv cov ces kaum yog tsim los ntawm ib tug transversal intersecting ob parallel kab. Lawv nyob nruab nrab ntawm ob qho tib si kab tab sis nyob rau sab nraud ntawm lub transversal, tsim ob khub (plaub tag nrho cov ces kaum) ntawm cov ces kaum sab hauv. Hloov cov ces kaum sab hauv yog congruent, txhais tau tias lawv muaj qhov sib npaug
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
Dab tsi yog txoj cai kaum rau lwm lub kaum sab xis?
Hloov cov ces kaum sab hauv yog tsim thaum lub transversal hla dhau ob kab. Lub kaum sab xis uas tsim nyob rau sab nraud ntawm lub transversal thiab sab hauv ob kab yog alternate sab hauv cov ces kaum. Lub theorem hais tias thaum cov kab sib npaug, qhov sib txawv sab hauv cov ces kaum sib npaug
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