diff --git a/education/math/Standard forms of circles.md b/education/math/Standard forms of circles.md
index 3d37236..9e04b67 100644
--- a/education/math/Standard forms of circles.md	
+++ b/education/math/Standard forms of circles.md	
@@ -3,7 +3,7 @@
 For $(f\circ g)(x)$ for two sets, you look for $x$ from $f$ and an equivalent $y$ value from $g$, and leftover coordinates are the answer. The order of $f$ and $g$ does matter. 
 # Formulae
 The general equation for a circle:
-$$ (x - h)^2 + (y - k)^2 =r $$
+$$ (x - h)^2 + (y - k)^2 =r^2 $$
 Distance formula:
 $$ \sqrt{(x_2-x_1)^2 + (y_2-y_1)^2} $$
 Midpoint foruma: