Find the radius and area of a circle, whose circumference is :

(i) 132 cm

(ii) 22 m

Find the radius and circumference of a circle, whose area is :

(i) 154 cm²

(ii) 6.16 m²

The area of a circle is 1386 sq. cm, find its circumference.

Find the area of a flat circular ring formed by two concentric circles (circles with same centre) whose radii are 9 cm and 5 cm.