Correct Answer - Option 3 : 22 cm

**Given:**

Volume of cylinder = 577.5 cm3.

Height of cylinder = 15 cm

**Formula used:**

Volume of cylinder = πr ^{2}h

Circumference of circle = 2πr

Here, r = radius, h = height

**Calculation:**

Volume of cylinder = 577.5 cm3.

⇒ πr 2h = 577.5 cm^{3}

⇒ (22/7) × r^{2} × 15 = 577.5

⇒ r2 = (577.5 × 7)/(22 × 15)

⇒ r2 = 12.25 cm^{2}

⇒ r = 3.5 cm

Circumference of circle = 2 × (22/7) × 3.5 = 22 cm

**∴ The circumference of its circular base is 22 cm.**