Video: Puas Rhombuses muaj lub kaum sab xis?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Ib square muaj ob khub ntawm parallel sab, plaub txoj cai kaum , thiab tag nrho plaub sab yog sib npaug. Nws tseem yog ib daim duab plaub thiab ib qho parallelogram. A rhombus txhais tau tias yog parallelogram nrog plaub sab sib npaug. Tsis yog, vim a rhombus ua tsis yog muaj rau muaj 4 txoj cai kaum.
Hauv qhov no, puas yog tag nrho cov kaum ntawm rhombus 90?
Hauv ib qho twg rhombus , cov kab pheeb ces kaum (kab txuas cov ces kaum sab nraud) sib cais ntawm txoj cai lub kaum sab xis ( 90 °). Ntawd yog, txhua kab pheeb ces kaum txiav rau lwm qhov rau ob qhov sib npaug, thiab qhov lub kaum sab xis qhov twg lawv hla ib txwm 90 qib.
Ib tug kuj yuav nug, lub rhombus nrog lub kaum sab xis zoo li cas? A rhombus zoo li ib pob zeb diamond ntxeev sab yog parallel, thiab opposite cov ces kaum yog sib npaug (nws yog Parallelogram). Thiab cov kab pheeb ces kaum "p" thiab "q" ntawm a rhombus bisect sib at txoj cai kaum.
Tom qab ntawd, pes tsawg lub kaum sab xis yog rhombus?
plaub
Cov duab twg muaj cov kaum sab xis?
Squares, duab plaub, thiab txoj cai triangles tag nrho muaj txoj cai kaum.
Pom zoo:
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
Lub quadrilateral puas muaj ib lub kaum sab xis?
Lub quadrilateral tau muab xws li 1: txhua sab yog sib npaug thiab 2: ob lub kaum sab xis ntxiv rau 90 degrees. Lub kaum sab xis ntawm lub quadrilateral yog cov kaum sab xis. Lub quadrilateral tsis yog rhombus
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