Video: Lub kaum sab xis ntawm kev sib hloov hauv lej yog dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Tus nqi ntawm kev sib hloov yog hu ua lub kaum sab xis ntawm kev sib hloov thiab ntsuas nyob rau hauv degrees. Los ntawm convention a kev sib hloov counter-clockwise yog qhov zoo lub kaum sab xis , thiab clockwise yog suav tias yog qhov tsis zoo lub kaum sab xis . Rays los ntawm qhov chaw kev sib hloov mus rau ib qho vertex tag nrho tig los ntawm tib yam lub kaum sab xis raws li daim duab tig.
Dhau li ntawm no, dab tsi yog qhov kev sib hloov degree?
Ib tug puv kev sib hloov yog 360 qib Nws txhais tau tias tig ib ncig kom txog thaum koj taw tes rau tib qho kev taw qhia dua.
Tsis tas li ntawd, kev sib hloov ntsuas li cas? A kev sib hloov yog ib qho kev hloov pauv hauv lub dav hlau uas tig txhua qhov taw tes ntawm daim duab los ntawm lub kaum ntse ntse thiab kev taw qhia txog qhov chaw ruaj khov. Tus nqi ntawm kev sib hloov yog hu ua lub kaum sab xis ntawm kev sib hloov thiab nws yog ntsuas hauv qib. Koj tuaj yeem siv tus protractor rau ntsuas lub teev lub kaum sab xis counterclockwise.
Nyob rau hauv kev hwm rau qhov no, dab tsi yog lub kaum sab xis ntawm kev sib hloov ntawm rhombus?
A rhombus muaj ob khub ntawm parallel sab. A rhombus muaj tag nrho plaub sab congruent. A rhombus muaj 2 (diagonals) axes ntawm reflectional symmetry. A rhombus muaj kev sib hloov symmetry ntawm 180º (Kev txiav txim 2).
Dab tsi yog qhov sib npaug rau kev sib hloov?
180 degrees yog (-a, -b) thiab 360 yog (a, b). 360 degrees tsis hloov vim nws yog tag nrho kev sib hloov los yog ib lub voj voog puv. Thiab qhov no yog rau counterclockwise kev sib hloov . Yog koj xav ua clockwise kev sib hloov ua raws li cov no cov qauv : 90 = (b, -a); 180 = (-a, -b); 270 = (-b, ib); 360 = (ib, b).
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
Dab tsi yog kev saib xyuas ntawm kev ruaj ntseg sab hauv txawm tias muaj kev hloov pauv hauv ib puag ncig sab nraud?
Kev saib xyuas ntawm kev ruaj ntseg sab hauv txawm tias muaj kev hloov pauv hauv ib puag ncig sab nraud yog hu ua homeostasis
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 kev sib raug zoo ntawm latitude thiab lub kaum sab xis ntawm insolation?
Lub kaum sab xis ntawm hnub ci hluav taws xob thiab kub. Lub kaum sab xis ntawm cov hluav taws xob hnub ci tuaj cuam tshuam rau lub caij ntuj sov ntawm qhov chaw ntawm qhov sib txawv latitudes. Thaum lub hnub rays tawm tsam lub ntiaj teb qhov chaw nyob ze ntawm txoj kab nruab nrab, lub hnub ci hluav taws xob tuaj yeem ncaj qha dua (ze li ntawm lub kaum sab xis lossis ze dua rau lub kaum sab xis 90˚)
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