The area of the shadow part accounts for 1 / 5 of the big circle and 1 / 3 of the small circle. The area of the shadow part is 10cm2. What are the areas of the big circle and the small circle? The area of the shadow part accounts for 1 / 5 of the big circle and 1 / 3 of the small circle. The area of the shadow part is 10cm2. What is the ratio of the area of the big circle to the area of the small circle, and what are the areas of the big circle and the small circle

The area of the shadow part accounts for 1 / 5 of the big circle and 1 / 3 of the small circle. The area of the shadow part is 10cm2. What are the areas of the big circle and the small circle? The area of the shadow part accounts for 1 / 5 of the big circle and 1 / 3 of the small circle. The area of the shadow part is 10cm2. What is the ratio of the area of the big circle to the area of the small circle, and what are the areas of the big circle and the small circle

Small circle area = 10 △ 1 / 3 = 30 (square centimeter)
Large circle area = 10 △ 1 / 5 = 50 (square centimeter)
The ratio of large circle area to small circle area is 50:30 = 5:3

The area of the shadow is 1 / 5 of the area of the big circle and 1 / 3 of the area of the small circle
If the area of the shadow is 30 square centimeters, find the total area of this picture

The area of the great circle is 30 △ 1 / 5 = 150 square centimeters
Small circle area = 30 △ 1 / 3 = 90 square centimeter
The total area of this picture is 150 + 90-30 = 210 square centimeters

As shown in the figure, if the area of the shadow part is 2 / 5 of the area of the small circle and 1 / 7 of the area of the large circle ()
A. The area of a small circle is 5 / 14 of that of a large circle, 2 / 35 of that of a large circle, 9 / 14 of that of a small circle, and 9 / 5 of that of a large circle

Large circle area: small circle area = [1 / (2 / 5)] / [1 / (3 / 8)]
=(5/2)/(8/3)
=15/16
=15：16