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Triantán

Is cruth le trí taobhanna agus trí uillinn é triantán. Sa mhatamaitic, fíor phlánach, teorannaithe ag 3 líne dhíreach (na taobhanna). Más ionann an 3 thaobh, is triantán comhshleasach é. Más ionann dhá thaobh, is triantán comhchosach é. Thaispeáin na Gréagaigh go raibh suim na n-uillinneacha sa triantán cothrom le dhá dhronuillinn. Má bhíonn an uillinn is mó sa triantán níos lú ná dronuillinn, deirtear gur corrshleasach an triantán é. Más dronuillinn an uillinn is mó sa triantán, is triantán dronuilleach é agus feidhm le teoirim Phíotágaráis ann. Is triantán sféarúil triantán a tharraingítear ar dhromchla sféir, rud a dhéantar go minic i loingseoireacht. Ina leithéid de thriantán ní bhíonn suim na n-uillinneacha cothrom le dhá dhronuillinn. Mar shampla, is féidir triantán sféarúil a tharraingt le dhá rinn ar an meanchiorcal is an rinn eile ag an mol, agus suim na n-uillinneacha cothrom le 3 dhronuillinn.

Tá an t-alt seo bunaithe ar ábhar as Fréamh an Eolais, ciclipéid eolaíochta agus teicneolaíochta leis an Ollamh Matthew Hussey, foilsithe ag Coiscéim sa bhliain 2011. Tá comhluadar na Vicipéide go mór faoi chomaoin acu beirt as ucht cead a thabhairt an t-ábhar ón leabhar a roinnt linn go léir.
Is síol é an t-alt seo. Cuir leis, chun cuidiú leis an Vicipéid.
Má tá alt níos forbartha le fáil i dteanga eile, is féidir leat aistriúchán Gaeilge a dhéanamh.


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