A triangle is one of the basic shapes of geometry: a polygon with three corners or vertices and three sides or edges which are line segments. A triangle with vertices A, B, and C is denoted ABC.

In Euclidean geometry any three non-collinear points determine a unique triangle and a unique plane (i.e. a two-dimensional Euclidean space).

Types of triangles

By relative lengths of sides

Triangles can be classified according to the relative lengths of their sides:

  • In an equilateral triangle, all sides have the same length. An equilateral triangle is also a regular polygon with all angles measuring 60°.
  • In an isosceles triangle, two sides are equal in length. (Traditionally, only two sides equal, but sometimes at least two.) An isosceles triangle also has two angles of the same measure; namely, the angles opposite to the two sides of the same length.
  • In a scalene triangle, all sides and internal angles are different from one another.
Equilateral Isosceles Scalene

From Wikipedia under the GNU Free Documentation License
Thu Jul 16 08:05:53 2009

Lost in the Triangles Blog Archive Shaders must die, part 2
aras-p.info
Lost in the Triangles Blog Archive Shaders must die, part 2

Aras Pranckevi ius

2009-05-07 21:35:28

Categories. code (34); conferences (6); d3d (10); demos (20); games (15); gpu (16); opengl (10); papers (10); politics (2); random (33); rant (27); rendering (6); uncategorized (41); unity (24); work (35) ...

The Twin Triangles on Flickr - Photo Sharing!
flickr.com
The Twin Triangles on Flickr - Photo Sharing!

(dkuropatwa)

2007-12-09 19:24:35

Ed. Note: The image on the right, "The Learning Pyramid," is NOT based on any verifiable research; perhaps, no research at all (see this and that). This pyramid is widely cited yet it is, as Christopher Harris shared in an email, ...

Finding BonggaMom: How many triangles ?
bonggamom.blogspot.com
Finding BonggaMom: How many triangles ?

Bonggamom

2009-04-10 23:00:00

How many . triangles. ? This is the latest fad in our household... K'nex. The boys received a small set for their birthdays, and they quickly fell in love. I managed to find a teenager selling his huge boyhood Knex collection for a ...

From Google Blog Search: "triangles"
Fri May 8 09:44:37 2009

XL Capital Ltd Publishes 2008 Global Loss Triangles - MarketWatch (press release)
marketwatch.com
XL Capital Ltd Publishes 2008 Global Loss Triangles

MarketWatch (press release)

These documents are available in the Investor Relations section of the Company's website located at www.xlcapital.com. XL Capital Ltd, through its operating subsidiaries, is a leading provider of global insurance and reinsurance coverages to industrial ...

XL Capital Ltd Publishes 2008 Global Loss Triangles PR Newswire (press release)

all 10 news articles
Creating new landmarks - Philippine Star
philstar.com
Creating new landmarks

Philippine Star, Philippines

Perez describes the soaring interior as an interplay of triangles that directs the viewer to the focal point of the entire structure, a 12-meter metal cross. Space, form and light combine to make the church an exhilarating setting for communal ...
Fish phenomenon gets attention at Collinsville church - Belleville News Democrat
bnd.com
Fish phenomenon gets attention at Collinsville church

Belleville News Democrat,  USA

The skylight is a sort of pyramid made up of a series of triangles of glass with corrugated lines. There is nothing in it that would suggest a curve but perhaps that comes from light refraction. It isn't intentional and the shape actually has a tail on ...

From Google News Search: "triangles"
Tue May 26 00:34:15 2009

How do I calculate distance using similar triangles?
Q. I need to find the distance from my math classroom to a light post outside of the classroom. My teacher said we should use similar triangles, but I have no idea how to go about it. We cannot measure anything outside of the classroom, but we can measure things in the class. A clear explanation would be great!
Asked by Josh P - Sun Mar 1 10:51:42 2009 - - 3 Answers - 0 Comments

A. Need a tape measure, and some imagination, and some way of measuring such larger angles (could be done just using the distances, right - 3 per triangle if oblique). Get a broomstick for good precision or a long classroom ruler (if permitted). Let it be at a distance of 2m (why not!) from you. Try to measure where on the broom stick you can see the top of the light post - mark it with a pencil both top and bottom sighting as you sight from your sighting position. You probably need to be two to do this. Try to be somewhat accurate, and don't forget to make sure that your measurements takes into consideration the bottom of the light post too. That is why you should maybe use an oblique triangle. You need to have both the top side and… [cont.]
Answered by Fuzzy - Sun Mar 1 11:11:11 2009

Draw 2 not congruent scalene triangles with 5 pairs of congruent parts?
Q. The problem is to draw 2 scalene triangles with 5 pairs of congruent sides. They cannot be congruent, and this is supposed to be possible because congruent triangles have 6 pairs of congruent sides, not just 5. Any help ASAP is appreciated. Thanks!
Asked by lilwandabellsjie - Thu Oct 30 00:09:54 2008 - - 1 Answers - 0 Comments

A. a triangle on top and a triangle below it sharing the same bottom (something like this ) hope it helps, (im in algebra) :-)
Answered by rob b - Thu Oct 30 00:14:58 2008

What is the importance of triangles to our lives?
Q. please help me. this is my PROJECT for our last quarter. Please cite the importance of triangles to our lives. PLEASE?
Asked by random. - Fri Mar 6 04:35:32 2009 - - 7 Answers - 0 Comments

From Yahoo Answer Search: "triangles"
Thu Apr 23 11:09:51 2009