Kuyini unxantathu. Lokho abayikho

Iqiniso lokuthi unxantathu ezinjalo, sikwele, cube, isayensi isitshela geometry. Kuleli zwe lanamuhla ifundiswa ezikoleni ngothi lwawo. Ngenxa yesayensi ukuthi unxantathu enjalo study ngqo nalokho impahla yaso trigonometry. Sidingida ngokuningiliziwe zonke izenzakalo ezihlobene nala ngamajamo weJiyomethri. Iqiniso lokuthi unxantathu ezinjalo, sizobe ukukhuluma namuhla ku-athikili yethu. Lokhu okulandelayo kuzonisiza ukuchaza izinhlobo zabo, kanye ezinye theorems xhuma nga them.

Kuyini unxantathu? definition

Kuyinto ipholigoni flat. It has emakhoneni ezintathu, kuyacaca igama layo. Futhi-ke has izinhlangothi ezintathu kanye vertices ezintathu, owokuqala babo - ke welula, kwesibili - iphuzu. Ukwazi okuyinto engeli ababili bayalingana, eyesithathu zingatholakala ngokukhipha isamba ezimbili zokuqala inombolo 180.

Yiziphi onxantathu?

Bangakwazi ihlukaniswa ngokweminyaka criteria ehlukahlukene.

Okokuqala, bahlukene ku abukhali-angled, obtuse futhi elingunxande. ukuthi labo befundisi engeli abukhali, okungukuthi, labo okuyizinto engaphansi kuka-90 degrees. Kwelinye emakhoneni obtuse - obtuse, okuyile okuyinto degrees engaphezu kuka-90, abanye ababili - acute. Ukuze uthole unxantathu acute nazo equilateral. onxantathu okunjalo kuzo zonke izinhlangothi futhi engeli bayalingana. Bonke bangabangasokile elilingana degrees 60, kungashiwo kalula ibalwa sokuhlukanisa Inani lawo wonke engele (180) ngo ezintathu.

unxantathu wesokudla

Akunakwenzeka yini ukukhuluma ngalokho kuba unxantathu kwesokudla yomumo.

Ngo abe semqoka kangaka le engela 90 degrees (ngqo), khona-ke kukhona ezimbili ezinhlangothini zalo ahlelwe perpendicularly. Asele namakhona amabili ibukhali. Zingase alingane, khona-ke kuyinto unxantathu isosceles. Nge unxantathu yomumo exhunywe theorem kaPythagoras. Ngosizo ke ungathola wesithathu, ngokwazi ezimbili zokuqala. Ngokusho lokhu theorem, uma sifaka isikwele umlenze omunye komunye square, ungathola esigcawini hypotenuse. Umlenze square ingabalwa ngokukhipha esigcawini hypotenuse kuyinto esigcawini umlenze abadumile. Ngaphandle kweqiniso lokuthi unxantathu enjalo, ungakwazi ukukhumbula mayelana isosceles. Kuyinto enjalo lapho amabili ezinhlangothini futhi alinganayo kanye namakhona amabili.

Kuyini umlenze futhi hypotenuse?

Cathetus - ingenye izinhlangothi unxantathu, akha i-engela 90 degrees. Hypotenuse - luluhlangothi asele okungukuthi malungana engela kwesokudla. Kusukela umlenze wakhe, ungakwazi udedele perpendicular. Isilinganiso umlenze eseduze hypotenuse wayebizwa ngokuthi cosine, futhi okuphambene - sine.

unxantathu waseGibhithe - iziphi izici zayo?

Muhle kwesokudla. Imilenze yakhe iyizinsika elilingana amathathu ezine, kanye hypotenuse - ezinhlanu. Uma ubona ukuthi imilenze unxantathu ayalingana ezintathu noma ezine, ungaqiniseka ukuthi hypotenuse ilingana ezinhlanu. Futhi, ngokuvumelana nalesi simiso kungaba azimisele kalula ukuthi umlenze kuyoba amathathu uma yesibili ilingana ezine, kanye hypotenuse - ezinhlanu. Ukuze afakazele lokhu isitatimende, singasebenzisa theorem kaPythagoras. Uma cathetus ezimbili kukhona 3 no-4, bese 9 + 16 = 25, impande 25 - 5, isb hypotenuse kulingana 5. Futhi waseGibhithe ngokuthi unxantathu unxande kabani izinhlangothi ayalingana 6, 8 no-10; 9, 12 no-15, kanye nezinye izinombolo ne isilinganiso 3: 4: 5.

Yini singakwazi kube unxantathu?

Futhi onxantathu kungenziwa elalibhalwe futhi kuchazwe. Figure emhlabeni echaza umbuthano elalibhalwe ngokuthi, wonke vertices kwakhona amaphuzu elele umbuthano. Unxantathu - eyodwa lapho umbuthano olotshiwe. ohlangothini lwaKhe mbeni ke ezindaweni ezithile.

Kushiwo ngamuphi umqondo ukuthi endaweni unxantathu?

Le ndawo yanoma iluphi kukalwa amayunithi square (sq. Amamitha, sq. Amamilimitha angu, sq. Amasentimitha sq. Decimeters futhi t. D.) Lokhu value ingabalwa ngezindlela ezihlukahlukene, kuye ngohlobo unxantathu. Area yini Umumo emakhoneni zingatholakala ngokuvele azalane uhlangothi lwalo ku perpendicular kuso angle obuhlukile, futhi sokuhlukanisa lesi sibalo ngelesibili. Ungase futhi uthole lesi silinganiso ngokuvele azalane kwalezi zinhlangothi zombili. Khona-ke wande ukuthi inombolo by the sine ye-engeli elise phakathi kwezinhlangano, ulwahlukanise ithole ezimbili. Ukwazi nxazonke unxantathu, kodwa ngaphandle kokwazi emagumbini alo, ungathola enye indawo ngenye indlela. Ukuze wenze lokhu, udinga ukuthola ingxenye azungezwe. Bese phenya ukuthatha kude le inani izinkomba ezahlukene, futhi anandise amagugu ezine etholwe. Okulandelayo, thola impande square yenomboro elaphuma. Area unxantathu elalibhalwe zingatholakala ngokuvele azalane zonke izinhlangothi, futhi sokuhlukanisa ukuthi inombolo by the engaba umbuthano echazwe bazungeza, iphindwe kane.

Le ndawo unxantathu kuchazwa kanje: uhhafu azungezwe siphindwe engaba umbuthano eqoshwe kuwo. Uma unxantathu kuyinto equilateral, endaweni yalo ingatholakala kanje: ohlangothini squaring, siphindaphindeka sibalo okuholela impande skwele amathathu, bese ehlukana ukuthi inombolo, ephethwe ngabantu abane. Ngokufanayo, ungakwazi ukubala ukuphakama unxantathu, lapho zonke izinhlangothi bayalingana, ngoba omunye wabo kufanele iphindwe impande skwele amathathu, bese ehlukana le nombolo ngelesibili.

Theorems ezihlobene unxantathu

I theorems eziyisisekelo ezihlobana lesi sibalo kukhona theorem kaPythagoras njengoba kuchaziwe ngenhla, theorem Sines futhi cosines. Eyesibili (sine) wukuthi uma ikhona eceleni yahlukaniswa sine ye-engeli okuphambene kuso, kungenzeka ukuthola lo engaba umbuthano echazwe bazungeza, iphindwe ezimbili. Wesithathu (i-cosine) wukuthi, uma isamba sezikwele izinhlangothi ezimbili ukuwaphuza njengoba umkhiqizo izikhathi ezimbili cosine ye-engeli futhi uhlala phakathi kwalezi zinto zombili, uthola uhlangothi lwesithathu kwesikwele.

Dali Triangle - kuyini?

Abantu abaningi, uma ebhekene nale umqondo, ekuqaleni bacabanga ukuthi kunophawu oluthile definition geometry, kodwa akunjalo. Dali Triangle - yigama ezivamile izindawo ezintathu ukuthi zihlobene nokuphila umculi odumile. "Phezulu" kuba indlu lapho Salvador Dali wahlala enqabeni, alinika nomkakhe, kanye Museum of imidwebo surrealist. Ohambweni zalezi zindawo ungafunda amaqiniso amaningi ezithakazelisayo mayelana lolu hlobo umculi yokudala, ezidumile emhlabeni wonke.