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circle1.py

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+# Program circle1.py
+
+startUpMessage = '''
+This program calculates the area of a circle. 
+
+'''
+
+print(startUpMessage)
+
+import math
+PI = math.pi
+
+radius = float(input("Enter the radius of a circle "))
+
+area = PI * radius**2
+
+print(f"The area is {area:.2f}")
+print("\n")