Added circle and sphere calculations

circle1.py

@@ -0,0 +1,9 @@
+import math
+PI = math.pi
+
+radius = float(input("Enter the radius of a circle "))
+
+area = PI * radius**2
+
+print(f"The area is {area}")
+

sphere1.py

@@ -0,0 +1,10 @@
+
+import math
+PI = math.pi
+
+radius = float(input("Enter the radius of a sphere "))
+
+
+volume = 4 / 3 * PI  * radius**3
+
+print(f"The volume of the sphere is {volume}")