Correct Answer - Option 1 : 66 cm

**Given:**

Area = 154 sq. cm

New radius = r + 3.5

**Concept used:**

Area = πr2

Circumference of circle = 2 × π × r

**Calculation:**

πr2 = 154

r^{2} = 154 × 7/22 = 49

Or, r = 7 cm

New radius = 7 + 3.5 = 10.5 cm

Circumference = 2 × (22/7) × 10.5 = 66 cm

**∴ The circumference of the new circle is 66 cm.**