diff --git a/geometry.py b/geometry.py
new file mode 100644
index 0000000..35f7b21
--- /dev/null
+++ b/geometry.py
@@ -0,0 +1,13 @@
+from math import pi
+
+def area_rectangle(x, y):
+    return x*y
+
+def area_square(x):
+    return x*x
+
+def area_triangle(x, y):
+    return x*y*0.5
+
+def area_circle(r):
+    return pi*r*r