diff --git a/陈张本-26020007010-912523257.py b/陈张本-26020007010-912523257.py
index 4d137a2..938abc6 100644
--- a/陈张本-26020007010-912523257.py
+++ b/陈张本-26020007010-912523257.py
@@ -6,4 +6,10 @@ class Circle(Shape):
         self.radius = radius
 
     def area(self):
-        return math.pi * self.radius * self.radius
\ No newline at end of file
+        return math.pi * self.radius * self.radius
+class Square(Shape):
+    def __init__(self, side):
+        self.side = side
+
+    def area(self):
+        return self.side * self.side
\ No newline at end of file