# Some Facts about Trigonometry and Euclidean Geometry

Formalized Mathematics (2014)

• Volume: 22, Issue: 4, page 313-319
• ISSN: 1426-2630

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## Abstract

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We calculate the values of the trigonometric functions for angles: [XXX] , by [16]. After defining some trigonometric identities, we demonstrate conventional trigonometric formulas in the triangle, and the geometric property, by [14], of the triangle inscribed in a semicircle, by the proposition 3.31 in [15]. Then we define the diameter of the circumscribed circle of a triangle using the definition of the area of a triangle and prove some identities of a triangle [9]. We conclude by indicating that the diameter of a circle is twice the length of the radius

## How to cite

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Roland Coghetto. "Some Facts about Trigonometry and Euclidean Geometry." Formalized Mathematics 22.4 (2014): 313-319. <http://eudml.org/doc/270835>.

@article{RolandCoghetto2014,
abstract = {We calculate the values of the trigonometric functions for angles: [XXX] , by [16]. After defining some trigonometric identities, we demonstrate conventional trigonometric formulas in the triangle, and the geometric property, by [14], of the triangle inscribed in a semicircle, by the proposition 3.31 in [15]. Then we define the diameter of the circumscribed circle of a triangle using the definition of the area of a triangle and prove some identities of a triangle [9]. We conclude by indicating that the diameter of a circle is twice the length of the radius},
author = {Roland Coghetto},
journal = {Formalized Mathematics},
keywords = {Euclidean geometry; trigonometry; circumcircle; right-angled},
language = {eng},
number = {4},
pages = {313-319},
title = {Some Facts about Trigonometry and Euclidean Geometry},
url = {http://eudml.org/doc/270835},
volume = {22},
year = {2014},
}

TY - JOUR
AU - Roland Coghetto
TI - Some Facts about Trigonometry and Euclidean Geometry
JO - Formalized Mathematics
PY - 2014
VL - 22
IS - 4
SP - 313
EP - 319
AB - We calculate the values of the trigonometric functions for angles: [XXX] , by [16]. After defining some trigonometric identities, we demonstrate conventional trigonometric formulas in the triangle, and the geometric property, by [14], of the triangle inscribed in a semicircle, by the proposition 3.31 in [15]. Then we define the diameter of the circumscribed circle of a triangle using the definition of the area of a triangle and prove some identities of a triangle [9]. We conclude by indicating that the diameter of a circle is twice the length of the radius
LA - eng
KW - Euclidean geometry; trigonometry; circumcircle; right-angled
UR - http://eudml.org/doc/270835
ER -

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