The radius of small circle is 5cm, the radius of big circle is 7cm, the ratio of circumference of small circle to big circle is (), the ratio of area is ()

The radius of small circle is 5cm, the radius of big circle is 7cm, the ratio of circumference of small circle to big circle is (), the ratio of area is ()

The radius of small circle is 5cm, the radius of big circle is 7cm, the ratio of perimeter of small circle and big circle is (5:7), and the ratio of area is (25:49)