It's little bit confusing when I only use the cod

es without argumenting them for four times, but
 stacy told me it's because we have another programming
 running nested codes...that's interesting...

circle_area.py

@@ -4,3 +4,6 @@
 
 print("This program will calculate the area of a circle.")
 radius = float(input("What is the circle's radius? "))
+pi=3.141592653
+circle_area=pi*radius*radius
+print(circle_area)