7 Hom Ntawm Peb Hlis: Kev faib tawm raws li lawv sab thiab cov ces kaum

Zoo Siab

• Ib qho duab geometric uas tuaj yeem muab faib ua ntau yam yam ntxwv.
• Kev muaj txiaj ntsig ntawm daim duab peb sab
• Daim duab peb sab yog dab tsi
• Yuav ua li cas thiaj nrhiav tau ib puag ncig thiab thaj tsam ntawm daim duab peb sab
• Yuav ua li cas daim duab peb sab yog cais
• Peb tog raws li qhov ntev ntawm lawv ob sab
• 1. Daim duab peb sab sib npaug
• 2. Daim duab peb sab Scalene
• 3. Isosceles daim duab peb sab
• Peb tog raws li lawv cov ces kaum
• 4. Txoj cai daim duab peb sab
• 5. obtuse daim duab peb sab
• 6. Peb daim duab peb sab
• 7. Daim duab peb sab
• xaus

Ib qho duab geometric uas tuaj yeem muab faib ua ntau yam yam ntxwv.

Thaum peb tseem yog menyuam yaus, peb txhua tus tau mus kawm chav lej hauv tsev kawm ntawv, qhov uas peb yuav tsum tau kawm ntau yam sib txawv ntawm daim duab peb sab. Txawm li cas los xij, raws li xyoo dhau los, peb tuaj yeem hnov ​​qab qee yam uas peb tau kawm. Rau qee tus tib neeg kev ua lej yog lub ntiaj teb txaus nyiam, tab sis lwm tus txaus siab rau lub ntiaj teb ntawm cov tsiaj ntawv ntau dua.

Hauv kab lus no peb yuav tshuaj xyuas qhov sib txawv ntawm daim duab peb sab, yog li nws tuaj yeem muaj txiaj ntsig los kho qee cov ntsiab lus tau kawm yav dhau los lossis kawm txog yam tshiab uas tsis tau paub dua.

Kev muaj txiaj ntsig ntawm daim duab peb sab

Hauv kev ua lej, kawm geometry, thiab tshawb pom cov duab sib txawv xws li cov duab peb sab. Qhov kev paub no muaj txiaj ntsig rau ntau yam laj thawj; piv txwv li: txhawm rau kos duab kos duab lossis npaj phiaj xwm tsim kho thiab nws tsim kho.

Hauv qhov kev nkag siab no, thiab tsis zoo li lub duab plaub uas tuaj yeem hloov pauv mus rau hauv daim duab plaub thaum lub zog siv rau ib qho ntawm nws ib sab, ob sab ntawm daim duab peb sab tau tsau. Vim yog qhov nruj ntawm nws cov duab, cov kws tshawb fawb pom tias daim duab peb sab tuaj yeem tiv taus qhov siab ntawm qhov quab yuam yam tsis hloov pauv. Yog li ntawd, kws kes duab vajtse thiab cov kws tsim khoom siv lub voos xwmfab thaum tsim cov choj, lub ru tsev ntawm lub tsev, thiab lwm yam kev teeb tsa. Thaum cov voos peb sab tau tsim ua cov qauv, kev tiv thaiv nce los ntawm kev txo qis ib sab.

Daim duab peb sab yog dab tsi

Daim duab peb sab yog ib lub duab plaub, daim duab tiaj tus uas muaj thaj tsam tab sis tsis muaj ntim. txhua daim duab peb sab muaj peb sab, peb lub kaum sab xis thiab peb lub kaum sab hauv, thiab qhov sib npaug ntawm cov no yog 180º

Daim duab peb sab yog tsim los ntawm:

Hauv cov duab no, ib qho ntawm ob sab ntawm daim duab no ib txwm tsawg dua qhov sib npaug ntawm ob sab, thiab hauv daim duab peb sab uas muaj ob sab sib npaug, nws cov ces kaum sib npaug kuj zoo ib yam.

Yuav ua li cas thiaj nrhiav tau ib puag ncig thiab thaj tsam ntawm daim duab peb sab

Ob qhov kev ntsuas uas peb xav paub txog peb tog yog ib puag ncig thiab thaj chaw. Txhawm rau suav thawj zaug, nws yog qhov tsim nyog ntxiv qhov ntev ntawm txhua sab nws:

P = ib + b + c

Hloov chaw, txhawm rau paub seb thaj tsam ntawm daim duab no yog li cas, cov qauv hauv qab no tau siv:

A = ½ (bh)

Yog li ntawd, thaj tsam ntawm daim duab peb sab yog lub hauv paus (b) lub sijhawm siab (h) muab faib ua ob, thiab qhov txiaj ntsig ntawm qhov kev ua zauv no tau hais tawm hauv cov square square.

Yuav ua li cas daim duab peb sab yog cais

Muaj ntau hom sib txawv ntawm daim duab peb sab, thiab lawv tau muab cais los txiav txim siab txog qhov ntev ntawm lawv ob sab thiab qhov dav ntawm lawv cov ces kaum. Coj mus rau hauv tus account nws sab, muaj peb hom: sib npaug, isosceles thiab scalene. Raws li lawv cov ces kaum, peb tuaj yeem paub qhov txawv, obtuse, mob hnyav, thiab daim duab peb sab.

Peb mus txuas ntxiv rau lawv hauv qab no.

Peb tog raws li qhov ntev ntawm lawv ob sab

Coj mus rau hauv tus account qhov ntev ntawm ob sab, daim duab peb sab tuaj yeem yog hom sib txawv.

1. Daim duab peb sab sib npaug

Ib daim duab peb sab sib npaug muaj peb sab ntawm qhov ntev sib npaug, ua rau nws muaj ntau yam duab tas li. Cov ces kaum hauv daim duab peb sab sib npaug kuj sib npaug (60º txhua). Thaj tsam ntawm hom duab peb sab no yog lub hauv paus ntawm 3 txog 4 zaug qhov ntev ntawm ob sab. Qhov puag ncig yog qhov khoom ntawm qhov ntev ntawm ib sab (l) thiab peb (P = 3 l)

2. Daim duab peb sab Scalene

Ib daim duab peb sab scalene muaj peb sab ntawm qhov ntev sib txawv, thiab nws cov ces kaum kuj muaj qhov ntsuas sib txawv. Qhov puag ncig yog sib npaug ntawm qhov sib npaug ntawm qhov ntev ntawm nws peb sab. Qhov ntawd yog: P = a + b + c.

3. Isosceles daim duab peb sab

Ib daim duab peb sab isosceles muaj ob sab sib npaug thiab ob lub kaum, thiab txoj hauv kev los nrhiav nws puag ncig yog: P = 2 l + b.

Peb tog raws li lawv cov ces kaum

Cov duab peb sab kuj tseem tuaj yeem muab cais raws qhov dav ntawm lawv cov ces kaum.

4. Txoj cai daim duab peb sab

Lawv tau tshwj xeeb los ntawm kev muaj lub kaum sab xis sab hauv, nrog tus nqi ntawm 90º. Ob txhais ceg yog ob sab uas ua rau lub kaum sab xis no, thaum lub hypotenuse sib raug rau sab nraud. Thaj tsam ntawm daim duab peb sab no yog cov khoom ntawm nws ob txhais ceg faib ua ob. Ntawd yog: A = ½ (bc).

5. obtuse daim duab peb sab

Hom peb tog no muaj lub kaum sab xis ntau dua 90 ° tab sis tsawg dua 180 °, uas yog hu ua "obtuse", thiab ob lub kaum ntse ntse, uas tsawg dua 90 °.

6. Peb daim duab peb sab

Hom duab peb sab no yog tus yam ntxwv ntawm nws peb lub kaum sab xis uas qis dua 90 °

7. Daim duab peb sab

Nws yog daim duab peb sab sib luag, txij li nws lub kaum sab xis yog sib npaug 60 °.

xaus

Peb txhua tus tau kawm txog geometry hauv tsev kawm ntawv, thiab peb tau paub txog peb tog. Tab sis ntau xyoo, ntau tus neeg yuav hnov ​​qab tias lawv tus yam ntxwv zoo li cas thiab lawv raug cais li cas. Raws li koj tau pom hauv kab lus no, peb tog tau muab cais ua ntau txoj kev nyob ntawm qhov ntev ntawm lawv ob sab thiab qhov dav ntawm lawv cov ces kaum.

Geometry yog ib qho kev kawm uas kawm hauv lej, tab sis tsis yog txhua tus menyuam nyiam kawm txog qhov no. Qhov tseeb, qee qhov muaj teeb meem loj. Dab tsi ua rau qhov no? Hauv peb kab lus "Cov menyuam nyuaj rau kawm lej" peb piav qhia rau koj.