Lub cheeb tsam ntawm lub rhombus: cov qauv thiab cov ntsiab lus tseeb

Rhombus (los ntawm Greek thiab Latin ῥόμβος rombus «nruas") yog ib tug parallelogram, uas yog tsiag ntawv los ntawm muaj vaj huam sib luag ntev sab. Nyob rau hauv lub rooj plaub uas lub ces kaum yog 90 degrees (los yog nyob rau txoj cai ces kaum) xws geometric duab no yog hu ua square. Rhombus - ib tug duab daim duab, ib yam ntawm cov quadrangles. Nws yuav ua tau ib tug square, thiab ib tug parallelogram.

Lub hauv paus pib ntawm lub sij hawm

Wb tham me ntsis txog keeb kwm ntawm daim duab, uas yuav pab tau ib tug me ntsis ntawm discovering lub mysterious secrets ntawm lub ancient ntiaj teb no. Lub ib txwm lo lus rau peb, feem ntau tshwm sim nyob rau hauv lub tsev kawm ntawv cov ntaub ntawv, "cov pob zeb diamond" originates los ntawm Greek lo lus "lub nruas". Nyob rau hauv ancient Greece, cov suab paj nruas seev ua nyob rau hauv cov pob zeb diamond-zoo li tus los yog square (nyob rau hauv sib piv rau lub neej tshiab nimno txhia). Muaj tseeb koj tau pom hais tias lub card suits - diamonds - muaj ib tug rhombic zoo. Cov tsim ntawm no ce mus rov qab mus rau lub hnub thaum lub round diamonds yog tsis siv nyob rau hauv lub neej txhua hnub. Li ntawd, cov pob zeb diamond - hiob keeb kwm daim duab, uas yog invented los ntawm tib neeg ntev ua ntej cov log.

Rau thawj lub sij hawm xws li ib lo lus li "cov pob zeb diamond" siv los ntawm xws li nto moo personalities li Geron thiab Pope ntawm Alexandria.

thaj chaw ntawm ib tug rhombus

1. Txij li thaum lub rhombus sab opposite txhua lwm yam thiab yog ob leeg thaum uas tig mus, lub rhombus undoubtedly parallelogram (AB || CD, AD || BC).
2. Rhombic yog diagonally hla ntawm txoj cai ces kaum (AC ⊥ BD), thiab yog li perpendicular. Li ntawd, cov kev sib tshuam faib nyob rau hauv ib nrab diagonally.
3. Bisectors rhombic rhombus fab yog diagonally (∠DCA = ∠BCA, ∠ABD = ∠CBD thiab t. D.).
4. Lub keeb neeg ntawm parallelograms hais tias tus sum ntawm cov plaub fab ntawm lub diagonals ntawm ib tug rhombus yog tus naj npawb ntawm cov sab ntawm cov square, uas yog multiplied by 4.

tej yam tshwm sim ntawm ib tug rhombus

Rhombus nyob rau hauv cov neeg mob yog ib tug parallelogram uas muaj raws li cov nram qab no tej yam kev mob:

1. Tag nrho cov sab ntawm ib lub parallelogram yog muaj sib npaug.
2. Lub diagonals ntawm lub rhombus tshuam ntawm txoj cai ces kaum, i.e. lawv yog perpendicular txoj kev sib (AC⊥BD). Qhov no qhia tau hais tias cov kev cai ntawm peb sab (lub sab yog muaj sib npaug thiab muaj nyob rau ntawm lub kaum sab xis ntawm 90 degrees).
3. parallelogram diagonally sib cais ntawm cov ces kaum sib npaug, vim hais tias cov sab yog muaj sib npaug.

Lub cheeb tsam ntawm rhombus

Lub cheeb tsam ntawm lub rhombus yuav xam los ntawm txoj kev ob peb qauv (nyob ntawm seb cov ntaub ntawv uas muaj nyob rau hauv qhov teeb meem). Tom ntej no, nyeem txog dab tsi yog qhov chaw ntawm rhombus.

1. Lub cheeb tsam ntawm rhombus yog sib npaug zos rau cov xov tooj uas yog ib nrab ntawm cov khoom ntawm nws cov diagonals.
2. Txij li thaum pob zeb diamond - ib yam ntawm cov parallelogram, rhombus tus (S) yog tus naj npawb ntawm kev ua hauj lwm cheeb tsam sab ntawm ib tug parallelogram rau nws qhov siab (h).
3. Ntxiv mus, lub rhombus cheeb tsam yuav tsum xam los ntawm ib tug formula uas yog qhov khoom ntawm lub squared sab nyob rau hauv rhombus sine ntawm lub kaum sab xis. Sine ntawm lub kaum sab xis - alpha - ces kaum nyob nruab nrab ntawm lub hauv paus ntawm lub rhombus sab.
4. Nws yog siv tau rau kom yog kev daws teeb meem xam tau tias yog mis uas yog qhov khoom ntawm ob zaug lub kaum sab xis alpha thiab lub voos kheej-kheej ntawm lub incircle (r).

Cov qauv, koj yuav tau xam thiab ua pov thawj rau lub hauv paus ntawm lub Pythagorean theorem thiab cov kev cai rau peb sab. Muaj ntau yam piv txwv muaj teem nyob rau kev koom tes ntawm ob peb cov qauv nyob rau hauv ib txoj hauj lwm.