Area between the circumferences of two concentric circles is . The inner circle has a circumference of cm, Find the radius of the outer circle.

Given that,

Area between the circumferences of two concentric circles is

Circumference of inner circle cm

Circumference

Radius of circle (r) cm

Radius of the inner circle is cm.

Area of inner circle

Area of inner circle

Area of outer circle = area of inner circle + area of concentric circles

Area of outer circle

Let assume  R be the radius of outer circle,

Area of outer circle

R cm

Hence, the radius of the outer circle is cm.