A pizza parlor in Portland sells a pizza with an 18-inch diameter. A pizza parlor in San Anita, Peru, sells a pizza with a 30.6-centimeter diameter.

Part A: How many square inches of pizza is the pizza from Portland? Show every step of your work.

Part B: How many square centimeters of pizza is the pizza from San Anita, Peru? Show every step of your work.

Part C: If 1 in. = 2.54 cm, which pizza has the larger area? Show every step of your work.

Part D: What is the scale factor from the pizza in Portland to the pizza in San Anita, Peru?