File:Similar triangles.png

This is a retouched picture, which means that it has been digitally altered from its original version. The original can be viewed here: Triangle180proof.png: . Modifications made by דוד שי.

I, the copyright holder of this work, hereby publish it under the following licenses:

This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.

You are free:

• to share – to copy, distribute and transmit the work
• to remix – to adapt the work

Under the following conditions:

• attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
• share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.

https://creativecommons.org/licenses/by-sa/3.0CC BY-SA 3.0 Creative Commons Attribution-Share Alike 3.0 truetrue

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue

You may select the license of your choice.

This image is a derivative work of the following images:

• File:Triangle180proof.png licensed with Cc-by-sa-3.0, GFDL
  • 2010-05-21T10:45:50Z MathKnight 430x251 (6247 Bytes) {{Information |Description={{en|1=Proof that the sum of [[angle]]s in a [[triangle]] is 180 degrees: draw a parallel line to the base of the triangle that intersects the vertex of \gamma . Because the lines are parallel, the

Uploaded with derivativeFX