Question

Draw concentric circle for radii measuring 4.2 cm and 6.8 cm . Find out the width of circular ring.

Answer 1

Step 1 - Draw a circle with radius $r=4.2$ cm and name the centre as $O$.

Step 2- Taking $O$ as the center, draw another circle of radius $R=6.8$ cm.

Then, the figure results in concentric circles with a radius $6.8$ and $4.2$ cm.

Therefore, width of circular ring $=R-r=6.8-4.2=2.6$ cm.