Le ndawo irhombus: neefomula kunye izibakala

Irhombus (ukusuka isiGrike Latin ῥόμβος rombus «igubu") yi parallelogram, esibonakala bubukho macala ubude alinganayo. Kwimeko apho engile na 90 (okanye engile ekunene) nani zejiyometri kuthiwa square. Irhombus - umzobo zejometri, kukho uhlobo quadrangles. Kusenokwenzeka isikwere, kunye parallelogram.

Imvelaphi ye igama elithi

Makhe sithethe kancinci malunga ngembali mzobo, nto leyo eya kunceda kancinci Usihlube iimfihlelo twisiseka zehlabathi lamandulo. Igama njengesiqhelo kuthi, ngokufuthi ibakho uncwadi esikolweni, "diamond" ivela kwigama lesiGrike elithi 'igubu ". E Greece yamandulo, izixhobo zomculo ekuveliseni ledayimani-ezimilise okanye isikwere (ngokwahlukileyo kwi tshintsho mihla). Ngokuqinisekileyo uye waphawula ukuba iisuti ikhadi - iidayimani - ngokumila rhombic. Ukuqulunqwa kwale isuti iya emva kweentsuku xa dayimani ngeenxa hayi ezisetyenziswa kubomi bemihla ngemihla. Ngenxa yoko, nekalikedo - endala waphila, nto leyo omashini abenziwe ngabantu elide phambi kokuba kweevili.

Kuba okokuqala igama ezifana "diamond" yayisetyenziswa abantu abaziwayo ezifana Geron kunye Pope of Alexandria.

iimpawu irhombus

1. Ekubeni macala irhombus malunga nenye kwaye azikhethe ngaxeshanye, lo irhombus ngokuqinisekileyo parallelogram (AB || CD, AD || BC).
2. Rhombic ke kwikonw ngekona ukunqumla kwi engile (AC ⊥ BD), yaye nkqo. Ngenxa yoko, kuhlangana iyahlula kwisiqingatha kwikonw ngekona.
3. Bisectors iikona irhombus rhombic ezi kwikonw ngekona (∠DCA = ∠BCA, ∠ABD = ∠CBD kunye t. D.).
4. Uchazo lwe parallelograms ukuba udibaniso lwezikweri zonke idayagonali ye irhombus linani emacaleni isikwere, nto leyo iphindwe 4.

zimpawu yiRHOMBUS

Irhombus kwezo macala a parallelogram ezifezekisayo miqathango ilandelayo:

1. Zonke emacaleni parallelogram bayalingana.
2. I idayagonali ye irhombus phambana kwi engile yakho, ngamanye amazwi ukuba nkqo ngokuphathelele omnye komnye (AC⊥BD). Oku kungqina ukuba umthetho kumacala amathathu (amacala alinganayo kwaye zibekwe kwi-engile degrees 90).
3. parallelogram iikona kwikonw ngekona ezahlulwe ngokulinganayo, kuba emacaleni bayalingana.

Ummandla irhombus

Le ndawo irhombus kungabalelwa ngokusebenzisa ifomula ezininzi (ngokuxhomekeke izinto zokufunda ezinikiweyo kule ngxaki). Emva koko, funda ngoko na indawo irhombus.

1. Ummandla irhombus lilingana nenani leyo isiqingatha imveliso idayagonali yayo.
2. Ekubeni diamond - uhlobo lwe parallelogram, irhombus i (S) linani kwicala indawo umsebenzi parallelogram kwi ukuphakama kwayo (h).
3. Ngaphezu koko, le ndawo irhombus nga ubalwe indlela yona imveliso ye emacaleni ophindwe kabini kwi irhombus sine ye ekujikeni. Sine ye angela - alpha - kwikona ephakathi umthombo macala irhombus.
4. Kwamkelekile ukuba izisombululo ezichanekileyo ingqalelo ifomula yona imveliso ye kabini angela alpha kunye embindini le incircle (r).

Le fomyula, unako ukubala ukubonisa ngokusekelwe kwi theorem kaPythagoras kunye nemithetho macala omathathu. imizekelo emininzi swi ukubandakanywa iifomyula eziliqela emsebenzini.