Step 1: Draw a rough diagram and mark the given measurements.
Step 2: Take a point O and mark it as the centre.
Step 3: With O as centre and draw a circle of radius OA = 6 cm
Step 4: With O as centre and draw another circle of radius OB = 7.1 cm.
Thus the concentric circles C₁ and C₂ are drawn.
Width of the circular ring = OB - OA = 7.1 - 6 = 1.1cm

\(\mathrm{r}_{1}=\frac{6.2}{2}=3.1 \mathrm{~cm}\)

Step 1: Draw a rough diagram and mark the given measurements.
Step 2: Take a point O and mark it as the centre.
Step 3: With O as centre and draw a circle of radius OA.= 3.1 cm
Step 4: With O as centre and draw another circle of radius OB = 3.1 cm.
Thus the concentric circles C₁, and C₂ are drawn.
Width of the circular ring = OB - OA = 6.2 - 3.1 = 3.1 cm

Step 1: Draw a rough diagram and mark the given measurements.
Step 2: Take a point O and mark it as the centre.
Step 3: With O as centre and draw a circle of radius OA = 5 cm.
Step 4: With O as centre and draw another circle of radius OB = 7.5 cm.
Thus the concentric circles C₁ and C₂ are drawn.
Width of the circular ring = OB - OA = 7.5 - 5 = 2.5cm.

Step 1:Draw a rough diagram and mark the given measurements
Step 2: Take a point O and mark it as the centre.
Step 3: With O as centre and draw a circle of radius OA = 3.5 cm
Step 4: With O as centre and draw another circle of radius OB = 6.5 cm.
Thus the concentric circles C₁ and C₂ are drawn.
Width of the circular ring = OB -OA
= 6.5 - 3.5 = 3cm

Step 1 : Draw a rough diagram and mark the given measurements.
Step 2: Mark a point O on the paper.
Step 3: Extend the compass distance equal to the radius 3.5cm.
Step 4: At center O, Hold the compass firmly and place the pointed end of the compass.
Step 5: Slowly rotate the compass around to get the circle.