Question 1 Which is different? What is the area of a circle with a diameter of 1 m? What is the area of a circle with a diameter of 1 m? What is the area of a circle with a diameter of 100 cm? What is the area of a circle with a diameter of 100 cm? What is the area of a circle with a radius of 100 cm? What is the area of a circle with a radius of 100 cm? What is the area of a circle with a radius of 500 mm?