# Answer to Question #70391 in Python for Cayla Collins

Question #70391

print ("Enter 1 to calculate the area of a circle")

print ("Enter 2 to calculate the surface area of a sphere")

print ("Enter 3 to calculate the volume of a sphere")

print ("Enter 4 to quit")

Assuming the choice is 1-3, ask the user for the radius. If the user enters a string that cannot be interpreted

as a number, display the error message: Radius needs to be a number. If the user enters a nonpositive

number, display the error message: The radius has to be positive. Once you have a

positive radius, for choice 1, calculate the area of a circle by calling a function that calculates and returns the

area. For choice 2, calculate the surface area of a sphere by calling a function that calculates and returns

the surface area. For choice 3, calculate the volume of sphere by calling a function that calculates and

returns the volume. Your program should continue to display the menu, error check, and make calculations,

until the user enters choice 4.

print ("Enter 2 to calculate the surface area of a sphere")

print ("Enter 3 to calculate the volume of a sphere")

print ("Enter 4 to quit")

Assuming the choice is 1-3, ask the user for the radius. If the user enters a string that cannot be interpreted

as a number, display the error message: Radius needs to be a number. If the user enters a nonpositive

number, display the error message: The radius has to be positive. Once you have a

positive radius, for choice 1, calculate the area of a circle by calling a function that calculates and returns the

area. For choice 2, calculate the surface area of a sphere by calling a function that calculates and returns

the surface area. For choice 3, calculate the volume of sphere by calling a function that calculates and

returns the volume. Your program should continue to display the menu, error check, and make calculations,

until the user enters choice 4.

Expert's answer

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