Cov duab trapezoid thiab nws cov khoom

Qhov no geometric zoo - lub Trapezoid - yog tsis tsuas yog ntawm kev kawm txog zauv, tiam sis kuj lub cev tis. Tom qab tag nrho, txhua yam uas tau muab hauv tsev kawm ntawv cov ntaub ntawv qhia muaj feem xyuam. Piv txwv li, paub txog dab tsi yog qhov chaw ntawm lub lub Trapezoid, koj yuav tau yooj yim nrhiav tau lub cev ntawm txoj kev ntawm ib tug uniformly ceev tsab ntawv tsa suab. Yuav ua li cas ua li no? Tam sim no xav txog.

Cheeb Tsam tej hom ntawm cov nuj nqis yog xam nyob rau hauv ntau txoj kev. Nyob rau hauv peb cov ntaub ntawv, nws yog qhov tsim nyog yuav tsum paub qhov lej ntawm ob lub hauv paus thiab qhov siab. Kawg ib qho yog ib qho ntawm ob sab, pw ntawm txoj cai kaum. Tag nrho, qhov kev xav tau yog xam raws li hauv qab no:

S = (a + b) * h / 2

Ntawm chav kawm, qhov kev ywj pheej no tsis yog coj los ntawm lub qab nthab. Nws yog tau hais tias ib tug neeg paub txog qhov nruab nrab, uas muaj ob qho tib si ua ke thiab ib tus duab trapezoid. Yog hais tias nws yog denoted los ntawm tsab ntawv m, ces tus nqi yuav nrhiav tau raws li nram no: m = (a + b) / 2. Ua tib zoo, xaub cov ntawv no. Nws yuav ua tau ib yam dab tsi zoo li ntev npaum li cas ntawm ib lub duab plaub paub. Nws yog nyob rau qhov txo rau qhov nyuaj tshaj plaws uas thawj txo kev tsim kho yog tsim. Feem ntau, qhov qog rau cheeb tsam ntawm ib lub duab trapezoid muaj feem sib hloov tau qhov siab (qhov siab) ntawm sab ntev ntawm lub kaum sab xis ntawm 90 degrees. Qee tus yuav tsum paub sai li sai tau hais tias qhov no yog qhov ncaj ncees los ntawm qhov sib luag ntawm cov khoom no.

Nyob rau hauv thaum pib, peb twb hais tseem tau thov cov nqi ntawm ib daim duab hauv physics. Qee qhov, txoj cai tswjfwm ntawm kev ua haujlwm ceev nrawm yuav tsum paub zoo rau cov menyuam kawm ntawv. Ib lub duab trapezoid yog cov ntaub ntawv qhov pib tshaj tawm xoom, qhov tsuj yog qhov. Yog tias txoj hauj lwm ua rau koj xav kom koj xam txoj kev tau txais qhov teeb meem no, ces koj tuaj yeem siv tus qauv mus nrhiav thaj chaw. Qhov txawv ntawm "ib tug" cia nws qhia tag nrho lub sijhawm ntawm txoj kev. Peb yuav tsum hais tam sim ntawd kom peb ua haujlwm nyob rau hauv Cartesian coordinate system. Ces, "b" qhia lub sij hawm thaum lub sij hawm uas yog lub siab tshaj plaws ceev. Li no, yog tias, mus txog rau thaum xaus ntawm qhov lus taw kev, nws tseem nyob twj ywm sib npaug, ces b = 0. Rau h peb coj tus nqi ntawm tus yees ceev. Tom qab hloov lub txiaj ntsim, koj tau txais txoj kev, vim nws muaj peev xwm xam los ntawm formula S = V nruab nrab * t. Tam sim no koj paub li cas ib daim duab trapezoid tau pab tau koj.

Yuav kom daws tau cov teeb meem ib qho yuav tsum paub tsuas yog ob peb daim qauv rau cov lus nug. Piv txwv, qhov sib npaug ntawm cov ces kaum ntawm sab sab yog 180 degrees. Kab pheeb ces kaum nrog hwm rau ib qhov ntawm lub sab yog lub hypotenuse ntawm ib txoj cai daim duab peb sab nrog ob txhais ceg ntawm lub paub. Nco ntsoov tias kom deb ntawm cov quadrilateral, tshwj xeeb tshaj yog nyob rau hauv ib lub trapezoid rectangular, koj tuaj yeem nkag rau lub voj voos. Muaj ntau lub ntsiab lus hauv tsev kawm ntawv, tab sis qhov tseem ceeb tshaj plaws yog muab rho tawm los ntawm lawv. Piv txwv, qhov tseeb tias ib lub duab trapezoid muaj tag nrho cov khoom ntawm lub cev trapezoid, tab sis kuj muaj qee nta ntxiv. Xav tias lub hauv paus yog plaub, lub sab yog peb, thiab tus kabmob uas txuas lawv yog 5. Los ntawm Pythagorean theorem, 3 * 3 + 4 * 4 = 5 * 5. Los ntawm no nws ua raws li hais tias peb muaj ib lub duab trapezoid.

Yog li, koj tau ntsib ib daim duab geometric ntxiv. Cov qauv ntawm kev nrhiav qhov cheeb tsam tsis tas yuav tsum tau kawm, nws yog txaus los nkag siab lub hauv paus ntsiab lus ntawm kev suav.