The shadow area in the figure below is 3 square centimeters, which is one seventh of the area of the big circle and one fourth of the area of the small circle. What is the blank area?

The shadow area in the figure below is 3 square centimeters, which is one seventh of the area of the big circle and one fourth of the area of the small circle. What is the blank area?

Area = 3 / 1 / 7 + 3 / 1 / 4-3-3 = 27 square centimeters

The area of the shadow part is 3 square centimeters, which is 18 times of the area of the big circle and 15 times of the area of the small circle?

The blank area of large circle is 3 △ 18-3 = 24-3 = 21 (square centimeter) and that of small circle is 3 △ 15-3 = 15-3 = 12 (square centimeter). The blank area is 21 + 12 = 33 (square centimeter). A: the blank area is 33 square centimeter

The area of the shadow part is 3 square centimeters, which is 18 times of the area of the big circle and 15 times of the area of the small circle?

The blank area of large circle is 3 △ 18-3 = 24-3 = 21 (square centimeter) and that of small circle is 3 △ 15-3 = 15-3 = 12 (square centimeter). The blank area is 21 + 12 = 33 (square centimeter). A: the blank area is 33 square centimeter