Question

Draw concentric circle for the following measurements of radii/diameters. Find out the width of the circular ring.

r = 7.1 cm and d = 12 cm

Answer 1

r = 7.1 cm and d = 12 cm

r = `"d"/2`

∴ r = `12/2` = 6 cm and r = 7.1 cm

Step 1: Drawn a rough diagram and marked the given measurements

Step 2: Taken any point O and marked it as center.

Step 3: With O as center, drawn a circle of radius OA = 6 cm.

Step 4: with O as center, drawn a circle of radius OB = 7.1 cm.

Thus concentric circles C₁ and C₂ are drawn.

Width of the circular ring = OB – OA = 7.1 – 6 = 1.1 cm