diff --git a/content/images/triangle.png b/content/images/triangle.png
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Binary files a/content/images/triangle.png and /dev/null differ
diff --git a/content/toc.md b/content/toc.md
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+++ b/content/toc.md
@@ -24,5 +24,4 @@
 * [Object Oriented Programming](/oop/)
 * [OOP Macro](/oop_macro/)
 
-<!-- * OpenGL  * [Triangle](/opengl/triangle/)-->
 {: #toc-list}