Izinhlobo onxantathu, emagumbini kanye izinhlangothi

Mhlawumbe sibalo eyisisekelo, elula futhi ezithakazelisayo geometry kuyinto unxantathu. Ngokuhamba isikole impahla yayo esemqoka, kodwa ngezinye izikhathi ulwazi ngendaba kwakhiwa akuphelele. Izinhlobo onxantathu ekuqaleni ukunquma nezici zabo. Kodwa umbono onjalo ihlala okuxubile. Ngakho manje sihlaziya kancane kabanzi ngayo.

Izinhlobo onxantathu zincike degree of engele ngesilinganiso. Lezi zibalo ostro-, straight- futhi obtuse. Uma zonke engele musa idlule ukubaluleka 90 degrees, lesi sibalo kungaba ngokuphepha ngokuthi oyingozi. Uma okungenani eyodwa ekhoneni unxantathu kuyinto 90 degrees, ke wena usebenzelana nge zenyathi elingunxande. Ngakho, kuzo zonke ezinye izimo olucutshungulwayo umumo weJiyomethri ngokuthi obtuse.

Kunezinkinga eziningi ngenxa zenyathi acute-angled. I lolwehlukanisa kuyinto indawo amaphuzu sangaphakathi empambana bisectors, medians futhi eziphakeme. Kwezinye izimo, le simo ngeke basuthe. Nquma uhlobo "unxantathu" sibalo akunzima. Kwanele ukwazi, ngokwesibonelo, i-cosine engela ngayinye. Uma noma yiliphi inani lingaphansi kuka-zero ke unxantathu Kunoma yikuphi, ingabe obtuse. Endabeni zero inkomba sibalo has a engela kwesokudla. Zonke kweqanda aqinisekisiwe izokutshela ukuthi ngaphambi kokuthi abe nombono acute-angled.

Asinakusho mayelana unxantathu wesokudla. Kuyinto ifomu ephelele kakhulu, lapho bonke okufanayo empambana iphuzu medians, bisectors futhi engamamitha. Maphakathi umbuthano elalibhalwe futhi kuchazwa futhi endaweni efanayo. Ukuze ukuxazulula izinkinga odinga ukukwazi ohlangothini olulodwa kuphela, njengoba ekucaleni engela, kanye nezinye izinhlangothi ezimbili zaziwa. Lokho uyisihluthulelo eyanikezwa ipharamitha eyodwa kuphela. Kukhona onxantathu isosceles. sici yabo eyinhloko - ukulingana izinhlangothi ezimbili nama-engeli ngasesinqeni.

Ngezinye izikhathi kukhona umbuzo omayelana nokuthi kukhona calantsatfu izinhlangothi inikezwe. Eqinisweni, ucelwa uma le ncazelo esifanelana izinhlobo eziyisisekelo. Ngokwesibonelo, uma isamba izinhlangothi ezimbili lingaphansi kuka yesithathu, empeleni abe semqoka kangaka alikho nhlobo. Uma umsebenzi ucelwa ukuthola cosines ka-engeli unxantathu nge izinhlangothi 3,5,9, kukhona iqhinga sobala. Lokhu zingase zichazwe ngaphandle kokuba amasu eziyinkimbinkimbi zezibalo. Ake sithi ufuna ukusuka endaweni A ukhombe B. Ibanga emgceni locondzile kuyinto 9 amakhilomitha. Nokho, uphoqeleka ukuba ukhumbule ukuthi kufanele uye ukhombe C esitolo. Ibanga kusuka ku-A kuya C ilingana amakhilomitha amathathu, futhi kusukela C B - 5. Ngakho eyatholakala ukuthi, lihambe esitolo, kuzodlula ikhilomitha engaphansi. Kodwa kusukela iphuzu C ingekho kwi ngqo umugqa AB, khona-ke kufanele uye ibanga owengeziwe. Lapha kukhona ukuphikisana. Yiqiniso, incazelo ezivamile. Izibalo akazi eyodwa ithuba lokubonisa ukuthi zonke izinhlobo onxantathu angaphansi ungubani eziyisisekelo. Lithi isamba izinhlangothi ezimbili ezingaphezu kuka ubude lwesithathu.

Noma yiluphi uhlobo ine Izakhiwo ezilandelayo:

1) Isibalo engele kulingana 180 degrees.

2) Kukhona njalo orthocenter - iphuzu empambana we emachibini ezintathu.

3) Womathathu imidiyeni sisuselwa vertex engele ingaphakathi aphambana endaweni eyodwa.

4) emhlabeni iyiphi unxantathu lingachazwa ngokuthi umbuthano. Ungase futhi ufake indingilizi kangangokuthi wayengesabi ezintathu kuphela amaphuzu contact ingahambi ngaphandle.

Manje bajwayelane izakhiwo eziyisisekelo, ezithinta izinhlobo ezahlukene onxantathu. Esikhathini esizayo, kubalulekile ukuqonda ukuthi yini wena obhekana nakho ikhambi yenkinga.