Find the area of a ring whose outer and inner radii are respectively 20 cm and 15 cm

Find the area of a ring whose outer and inner radii are respectively 23 cm and 12 cm.

Find the area of a ring whose outer and inner radii are 12 cm and 10cm respectively.

Find the area of a ring whose inner and outer radii are 15 cm and 18 cm respectively. Take pi=3.14

A race track is in the form of a ring whose outer and inner circumference are 506 m and 440 m respectively. Find the width of the track and also the area.

A race track is in the form of a ring whose outer and inner circumference are 506 m and 440 m respectively. Find the width of the track and also the area.

A race track is in the form of a ring whose inner and outer circumferences are 44cm and 66 cm respectively. Find the width of the track.

The outer radius and the inner radius of a circular ring are respectively 25 cm and 24 cm.Find the area of the region which falls under the ring.

The volume of the material of a hemispherical shell with outer and inner radii 9 cm and 7 cm respectively is approximately

A racetrack is in the form of a ring whose inner and outer circumferences are 437 m and 503 m respectively. Find the width of the track and also its area.

The volume of metal in a hollow sphere is constant. If the inner radius is increasing at the rate of 1 cm/sec, find the rate of increase of the outer radius when the radii are 4 cm and 8 cm respectively.