import math
def int_check(question, low, high):

    error = f"Oops - please enter an number that is higher or equal to {low} and lower or equal to {high} ."

    while True:

        try:
            response = float(input(question))

            if low <= response <= high:
                return response

            else:
                print(error)

        except ValueError:
            print(error)

radius = int_check("Enter radius: ", 0.1, 100)

circumference = 2 * math.pi * radius
area = math.pi * radius * radius
circ= f"The circumference of the circle is: {circumference:.2f} "
print(circ)
ar = f"The area of the circle is: {area:.2f} "
print(ar)