diff --git a/README.md b/README.md
index 828cb57..9f22c25 100644
--- a/README.md
+++ b/README.md
@@ -3,8 +3,10 @@
 - Circle: S = πR²
 - Rectangle: S = ab
 - Square: S = a²
+- Triangle: S = (a*h)/2
 
 ## Perimeter
 - Circle: P = 2πR
 - Rectangle: P = 2a + 2b
 - Square: P = 4a
+- Triangle: P = a + b + c