Raws li Mikhail Vasilievich Lomonosov, tus kws tshawb fawb nto moo ntawm xyoo pua 18th, hais tias, lej yog poj huab tais ntawm txhua yam kev tshawb fawb. Cov lus no yog ib qho kev sib cav nyob rau hauv kev pom zoo ntawm qhov tseeb tias txhua leej txhua tus yuav tsum paub txog cov ntsiab lus no. Thiab geometry yog ib lub ntsiab "modules" ntawm lej, uas, nyob rau hauv lem, yog raws li ib co kev paub thiab kev txawj ntse. Ib qho ntawm lawv yog lub peev xwm los txhais thiab paub qhov txawv ntawm cov duab geometric thiab stereometric los ntawm ib leeg, piv txwv li, kom paub qhov txawv ntawm rhombus los ntawm ib lub xwmfab. Thiab yog tias koj tam sim ntawd muaj teeb meem nrog kab lus kawg, kab lus no yuav pab koj.
Ua ntej, xav txog cov duab geometric no (rhombus thiab square) cais.
Basic properties of a rhombus
Yog li, raws li kev txhais, lub rhombus yog ib qho parallelogram nrog txhua sab sib npaug. Ib tug parallelogram yog ib tug polygon nrog 4 lub kaum sab xis, nrog rau sab nraud sib npaug. Raws li cov khoom tseem ceeb ntawm rhombus, lawv yog:
- Cov ntu ntawm kab pheeb ces kaum ntawm lub rhombus yog sib koom ua ke rau ib leeg. Qhov no yogtxhais tau hais tias cov kab pheeb ces kaum ntawm lub rhombus sib tshuam ntawm lub kaum sab xis ntawm 90º.
- Segments ntawm kab pheeb ces kaum ntawm lub rhombus nyob ntawm lub bisectors ntawm nws cov ces kaum. Qhov no txhais tau hais tias lub diagonals ntawm lub rhombus bisect nws cov ces kaum.
Basic properties of a square
Lub ntsiab lus ntawm ib lub square yog qhov no: lub square yog ib lub duab plaub nrog txhua sab sib npaug. Nyob rau hauv lem, ib daim duab plaub yog ib tug parallelogram nyob rau hauv uas txhua lub kaum sab xis yog (uas yog, sib npaug rau 90º). Cov khoom tseem ceeb ntawm ib lub square yog teev hauv qab no:
- Qhov nruab nrab ntawm symmetry ntawm ib lub xwmfab yog nyob ntawm qhov sib tshuam ntawm nws kab pheeb ces kaum. Qhov no txhais tau hais tias cov kab pheeb ces kaum ntawm square, sib tshuam, muab faib ua ib nrab.
- Cov ntu ntawm kab pheeb ces kaum ntawm cov square yog sib npaug.
- Segments ntawm kab pheeb ces kaum ntawm ib lub xwmfab nyob rau ntawm lub bisectors ntawm nws cov ces kaum. Qhov no txhais tau tias lawv faib nws cov ces kaum.
Dab tsi yog qhov txawv ntawm lub rhombus thiab square
Cia thaum kawg teb lo lus nug no. Tej zaum koj twb tau pom ntau qhov zoo sib xws hauv cov ntsiab lus thiab hauv cov lus piav qhia ntawm lub square thiab rhombus. Yog tias peb sib piv tag nrho cov zoo sib xws thiab qhov sib txawv ntawm cov duab geometric saum toj no, peb tuaj yeem pom tau yooj yim tias lawv txawv ntawm qhov square, tsis zoo li lub rhombus, muaj qhov ntsuas ntsuas ntawm kaum ib txwm sib npaug rau 90º. Thiab twb los ntawm qhov no nws ua raws li hais tias nyob rau hauv lub square, tsis zoo li ib tug rhombus, lub diagonals yeej ib txwm sib npaug zos rau ib leeg. Nws tuaj yeem xaus lus tias lub square yog, qhov tseeb, ib lub rhombus nrog lub kaum sab xis. Tab sis nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias thaum txhua lub square yog rhombus, tsis yog txhua lub rhombus yog square.
Yog koj tau ceev faj, tam sim no koj paub dab tsilub rhombus txawv ntawm ib lub xwmfab, uas txhais tau tias koj yuav siv tau qhov kev paub no hauv kev xyaum.
