- 2.2 cm2
- 3.3 m
^{2} - 5.2 cm2
- 1.1 m2

Option 2 : 3.3 m^{2}

**Formula used:**

Curved surface area of cylinder = 2 × πRh

Where,

R = radius of cyinder

h = height of cylinder

**Calculation:**

Given that,

Inner radius r = 7 cm

Outer radius R = 14 cm

Height of cylinder h = 2.5 m

Hence, total curved surface area of the cylindrical mould

A = Area of inner curved surface + Area of an outer curved surface

⇒ A = 2π(14 + 7) × (2.5 × 100)

⇒ A = 32970 cm^{2}

⇒ A ≈ 3.3 m^{2}

Hence, the total surface area of cylinder 3.3 m2.

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