It is known that the sum of the radii of the two circles is 6cm, the perimeter of the big circle is 25.12cm, the area of the small circle is () and there are two big and small circles, the radius of the big circle is 6cm, and the diameter of the small circle is 4cm The difference between the area of these two circles is very urgent

It is known that the sum of the radii of the two circles is 6cm, the perimeter of the big circle is 25.12cm, the area of the small circle is () and there are two big and small circles, the radius of the big circle is 6cm, and the diameter of the small circle is 4cm The difference between the area of these two circles is very urgent

1 question:
The radius of the great circle is:
25.12÷(2x3.14)=4(cm)
The radius of the small circle is:
6-4=2(cm)
The area of small circle is:
S=πr²=3.14x2²=12.56(cm²)
2 question:
The area of the great circle is:
S large = π R & # 178; = 3.14x6 & # 178; = 113.04 (CM & # 178;)
The area of the small circle is:
S small = π (D / 2) & # 178; = 3.14x (4 / 2) & # 178; = 12.56 (CM & # 178;)
The area difference between the two circles is:
113.04-12.56=100.48(cm²)