1. If the perimeter difference of two circles is 6.28cm, and the diameter of the big circle is three times of the radius of the small circle, the area of the small circle is 2. The radius of the small circle is 1 / 5 of the radius of the big circle, the circumference of the big circle is 5 / 5, and the circumference of the small circle is meter 3. The sector area is 57 decimeters & sup2;, and the center angle is 46 degrees. When the center angle increases to 92 degrees, the sector area increases by decimeters & sup2;

1. If the perimeter difference of two circles is 6.28cm, and the diameter of the big circle is three times of the radius of the small circle, the area of the small circle is 2. The radius of the small circle is 1 / 5 of the radius of the big circle, the circumference of the big circle is 5 / 5, and the circumference of the small circle is meter 3. The sector area is 57 decimeters & sup2;, and the center angle is 46 degrees. When the center angle increases to 92 degrees, the sector area increases by decimeters & sup2;

2. The radius of the small circle is 1 / 5 of the radius of the big circle, the circumference of the big circle is 5 / 5, and the circumference of the small circle is 1 / 25 of a meter
3. The sector area is 57 decimeters & sup2;, and the center angle is 46 degrees. When the center angle increases to 92 degrees, the sector area increases by 57 decimeters & sup2;