The diameter of a circle is 6 mm. Answer the parts below. Make sure that you use the correct units in your answers. If necessary, refer to the list of geometry formulas. (a) Find the exact area and circumference of the circle. Write your answers in terms of it. Exact area: D Exact circumference: H (b) Approximate the area and circumference of the circle. To do the approximations, use the 71: button on the ALEKS calculator and round your answers to the nearest hundredth. Approximate area: I] Approximate circumference: D I:I|I:I mm2 mm3 mm