diff --git a/guide/english/mathematics/coterminal-angles/index.md b/guide/english/mathematics/coterminal-angles/index.md
index 3f6c8104eb..d2b857dc08 100644
--- a/guide/english/mathematics/coterminal-angles/index.md
+++ b/guide/english/mathematics/coterminal-angles/index.md
@@ -3,13 +3,6 @@ title: Coterminal Angles
 ---
 ## Coterminal Angles
 
-This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/mathematics/coterminal-angles/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
-
-<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
-
-<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds  -->
-
-#### More Information:
-<!-- Please add any articles you think might be helpful to read before writing the article -->
-
+Coterminal angles are, in short, angles that share a terminal side. As there are 360 degrees in a circle, an angle A is coterminal with another angle B if B = A + (*K* * 360), where *K* is any integer. The logic behind this is that if you were to start at A and go one full rotation around the circle, you would end up back at A, as you would if you went 2, 5, or 10,000 rotations around the circle. Therefore, if you started at 0 and traveled A + (*K* * 360) degrees clockwise, you would end up at A.
 
+*K* as mentioned above can be negative. In this case, the coterminal angle will be negative. This still makes sense, as if you start at 0 degrees and travel A + (*K* * 360) **counterclockwise**, you will end up at A.