Final answer:
a) The circumference of the circular top is approximately 12.57 cm. b) The area of the circular top is approximately 12.57 cm^2. c) The radius of the circular top is 2 cm. d) The volume of the ribbon cannot be calculated without information about its height.
Step-by-step explanation:
a) To calculate the circumference of the circular top, we can use the formula C = 2πr, where r is the radius of the circular top. Given that the circular top has a diameter of 4 cm, the radius is half the diameter, so r = 2 cm. Plugging this into the formula, we get C = 2π(2 cm) = 4π cm, or approximately 12.57 cm.
b) The area of the circular top can be found using the formula A = πr^2. Plugging in the radius of 2 cm, we get A = π(2 cm)^2 = 4π cm^2, or approximately 12.57 cm^2.
c) The radius of the circular top is already given as 2 cm.
d) The volume of the ribbon can be calculated using the formula V = πr^2h, where r is the radius and h is the height of the ribbon. Since the circular top is the same as the ribbon, the height remains unknown. Therefore, it is not possible to calculate the volume of the ribbon without information about its height.