The perimeter difference of two circles is 94.2cm. The radius of the big circle is twice the diameter of the small circle. The sum of the areas of the two circles is calculated

The perimeter difference of two circles is 94.2cm. The radius of the big circle is twice the diameter of the small circle. The sum of the areas of the two circles is calculated

Let the diameter of the small circle be D, the radius of the large circle be 2D, 4D * 3.14-d * 3.14 = 94.2, and the result is d = 10cm, s = 5 * 5 * 3.14 + 20 * 20 * 3.14 = 1334.5cm ^ 2