Video: Yuav ua li cas koj dilate ib daim duab peb sab?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Pib nrog ΔABC, kos tus dilation duab ntawm lub daim duab peb sab nrog rau qhov chaw ntawm lub hauv paus chiv keeb thiab qhov ntsuas qhov ntsuas ntawm ob. Daim ntawv ceeb toom tias txhua qhov kev sib koom tes ntawm tus thawj daim duab peb sab tau muab faib los ntawm qhov ntsuas qhov ntsuas (x2). Dilations suav nrog kev sib ntxiv! Dilation nrog scale factor 2, muab faib los ntawm 2.
Ua raws li qhov no hauv kev xav, yuav ua li cas thaum koj dilate ib daim duab peb sab?
Dilation yog ib txoj hauv kev los tsim cov duab zoo sib xws. Txhua qhov taw tes yog ncab tawm sab nraud ntawm qhov chaw nruab nrab D los ntawm kev sib npaug ntawm qhov sib npaug los ntawm qhov ntsuas qhov ntsuas. (Tom qab yog tias qhov ntsuas qhov loj dua 1.) Txav cov ntsiab lus A, B, C los hloov cov duab daim duab peb sab.
Tsis tas li ntawd, koj yuav pom qhov ntsuas qhov ntsuas li cas? Mus nrhiav ib ntsuas qhov ntsuas nruab nrab ntawm ob daim duab zoo sib xws, nrhiav ob sab sib txuas thiab sau qhov piv ntawm ob sab. Yog tias koj pib nrog daim duab me me, koj ntsuas qhov ntsuas yuav tsawg dua ib. Yog tias koj pib nrog daim duab loj, koj ntsuas qhov ntsuas yuav loj dua ib.
Hais txog qhov no, ua li cas koj dilate ib daim duab los ntawm 4?
Ua a Dilation ntawm 4 ntawm point A (2, 3) uas koj tuaj yeem pom hauv daim duab hauv qab no. Muab cov kev sib koom ua ke ntawm qhov tseem ceeb (2, 3), hu ua daim duab, los ntawm 4 . Cov duab kos duab = (2 * 4 , 3 * 4 ) kom tau txais cov duab kos duab (8, 12).
Yuav ua li cas koj dilate ib tug polygon?
Daim duab tsim los ntawm a dilation zoo ib yam li daim duab qub. Qhov ntsuas qhov ntsuas ntawm a dilation yog qhov piv ntawm cov sab lengths. Hauv chav kawm no, qhov chaw nruab nrab ntawm dilation yuav ib txwm yog lub hauv paus. Rau dilate ib polygon , muab cov kev tswj hwm ntawm txhua qhov vertex los ntawm qhov ntsuas qhov ntsuas k thiab txuas cov vertices.
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
Koj ua pov thawj li cas ntawm cov ces kaum sab nrauv ntawm daim duab peb sab yog 360?
Lub kaum sab nrauv ntawm daim duab peb sab yog sib npaug rau qhov sib npaug ntawm cov kaum sab hauv sab nraud. Yog xav paub ntxiv txog qhov no saib Daim duab peb sab sab nraud lub kaum sab xis theorem. Yog tias lub kaum sib npaug raug coj los ntawm txhua qhov vertex, cov ces kaum sab nrauv ib txwm ntxiv rau 360 ° Qhov tseeb, qhov no muaj tseeb rau txhua qhov convex polygon, tsis yog daim duab peb sab
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
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
Yuav ua li cas koj pom ob sab ntawm daim duab peb sab prism?
Qhov sib npaug ntawm ob qhov yooj yim tshaj plaws yog: ntim = 0.5 * b * h * ntev, qhov twg b yog qhov ntev ntawm lub hauv paus ntawm daim duab peb sab, h yog qhov siab ntawm daim duab peb sab thiab ntev yog prism ntev. cheeb tsam = ntev * (a + b + c) + (2 * base_area), qhov twg a, b, saib xyuas sab ntawm daim duab peb sab thiab base_area yog thaj tsam peb sab