Video: Yuav ua li cas koj pom lub hauv paus cheeb tsam ntawm daim duab peb sab prism?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
A daim duab peb sab prism muaj peb daim duab plaub sab thiab ob daim duab peb sab ntsej muag. Yuav nrhiav tau cheeb tsam of thereectangular side, use the formula A = lw, where A = cheeb tsam , l = ntev, thiab h = qhov siab. Yuav nrhiav tau cheeb tsam ntawm daim duab peb sab ntsej muag, siv cov mis A = 1/2bh, qhov twg A = cheeb tsam , ib = puag , thiab h = qhov siab.
Tom qab ntawd, ib tug kuj yuav nug, yuav ua li cas koj nrhiav tau lub hauv paus ntawm daim duab peb sab prism?
Txhawm rau xam qhov ntim ntawm a daim duab peb sab prism , ntsuas qhov dav thiab qhov siab ntawm a daim duab peb sab puag , ces multiply puag los ntawm qhov siab los ntawm 1/2 los txiav txim qhov daim duab peb sab cheeb tsam. Tom ntej no, ntsuas qhov siab ntawm lub daim duab peb sab prism thiab muab qhov no los ntawm cov daim duab peb sab cheeb tsam kom tau ntim.
Tsis tas li ntawd, koj yuav nrhiav tau thaj tsam ntawm prism li cas? Yuav ua li cas nrhiav thaj tsam ntawm RectangularPrisms:
- Nrhiav thaj tsam ntawm ob sab (Length * Qhov siab) * 2 sab.
- Nrhiav thaj tsam ntawm sab uas nyob ib sab (Dav * Qhov siab) * 2 sab.
- Nrhiav thaj tsam ntawm qhov kawg (Length * Dav) * 2 kawg.
- Ntxiv peb qhov chaw ua ke kom pom thaj chaw saum npoo av.
- Piv txwv li: Qhov chaw saum npoo ntawm ib daim duab plaub prism 5 cm ntev, 3cm.
Kuj nug, ua li cas koj pom thaj tsam ntawm daim duab peb sab raws li pyramid?
Rau nrhiav qhov chaw cheeb tsam ntawm ib txwm daim duab peb sab pyramid , peb siv cov mis SA = A + (3/2)bh, qhov twg A = tus cheeb tsam ntawm cov pyramid puag, b = lub hauv paus ntawm ib lub ntsej muag, thiab h = qhov siab ntawm ib lub ntsej muag.
Yuav ua li cas koj pom qhov siab ntawm daim duab peb sab prism?
Feem ntau yam koj yuav tsum xam yog cov triangularprism ntim thiab nws qhov chaw. Ob qhov kev sib npaug tshaj plaws yog: ntim = 0.5 * b * h * ntev, qhov twg b yog qhov ntev ntawm lub hauv paus ntawm qhov daim duab peb sab ,h yog qhov siab ntawm daim duab peb sab thiab ntev yog prism ntev.
Pom zoo:
Yuav ua li cas koj pom tus nqi ntawm cosine ntawm daim duab peb sab?
Hauv txhua daim duab peb sab, lub cosine ntawm lub kaum sab xis yog qhov ntev ntawm sab uas nyob ib sab (A) faib los ntawm qhov ntev ntawm lub hypotenuse (H). Nyob rau hauv ib tug qauv, nws yog sau yooj yim li 'cos'. Feem ntau nco ntsoov li 'CAH' - lub ntsiab lus Cosine yog nyob ib sab ntawm Hypotenuse
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
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