Update app.py

app.py

@@ -18,7 +18,7 @@ def calculate_angle(a, b, c):
 # Function to calculate area using Heron's formula
 def calculate_area(a, b, c):
     s = (a + b + c) / 2
-    area = math.sqrt(s * (s - a) * (s - b) * (s - c))
+    area = np.sqrt(s * (s - a) * (s - b) * (s - c))
     return area
 
 # Function to calculate the perimeter