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Title:TANGENTNI ŠTIRIKOTNIKI
Authors:ID Krmelj, Nina (Author)
ID Hvala, Bojan (Mentor) More about this mentor... New window
Files:.pdf UNI_Krmelj_Nina_2011.pdf (1,64 MB)
MD5: CF48E554A779E1D4EC40718829CF72CB
PID: 20.500.12556/dkum/21de0a32-c60a-4730-80af-6e57738d4bf0
 
Language:Slovenian
Work type:Undergraduate thesis
Organization:FNM - Faculty of Natural Sciences and Mathematics
Abstract:Tangentni štirikotnik je konveksni štirikotnik, ki mu lahko včrtamo krog. Štirikotnik je tangenten natanko tedaj, ko se simetrale njegovih notranjih kotov sekajo v eni točki. Prav tako je štirikotnik tangenten natanko tedaj, ko sta vsoti dolžin nasprotnih stranic enaki. Poleg omenjenih dveh najbolj znanih karakterizacij je v diplomskem delu predstavljenih še nadaljnjih pet karakterizacij tangentnih štirikotnikov. Med njimi je tudi Chaojeva karakterizacija tangentnega štirikotnika s polmeri včrtanih krogov štirih trikotnikov. Na koncu so dodane formule za izračun polmera tangentnemu štirikotniku včrtanega kroga, med katerimi je tudi formula, ki je nastala kot del rešitve naloge na nekem matematičnem tekmovanju na Kitajskem.
Keywords:tangentni štirikotnik, včrtana krožnica, radij štirikotniku včrtane krožnice, trikotniku pričrtana krožnica.
Place of publishing:Maribor
Publisher:[N. Krmelj]
Year of publishing:2011
PID:20.500.12556/DKUM-18099 New window
UDC:51(043.2)
COBISS.SI-ID:18407432 New window
NUK URN:URN:SI:UM:DK:I2Z6TM2Q
Publication date in DKUM:30.05.2011
Views:5264
Downloads:329
Metadata:XML DC-XML DC-RDF
Categories:FNM
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Secondary language

Language:English
Title:TANGENTIAL QUADRILATERALS
Abstract:A tangential quadrilateral is a convex quadrilateral in which a circle can be inscribed. A quadrilateral is tangential if and only if the four angle bisectors meet at one point. Furthermore a quadrilateral is tangential if and only if its two pairs of opposite sides have equal sums. Apart from these two characterizations of tangential quadrilaterals in this diploma work we present other five characterizations of tangential quadrilaterals. One of them is Chao's characterization with the radii of the circles inscribed in the four triangles. A list of formulas is added at the end of this work necessary for the calculation of a radius of the inscribed circle of the tangential quadrilateral; among them is also a formula which was part of the solution of a contest problem in China.
Keywords:tangential qudrilateral, inscribed circle, radius of an inscribed circle, triangle excircles.


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