The radius of a cone is 5 cm and its slant height is 16 cm. It's total surface area (in cm²) will be:

Correct option is A

Given:
Radius of the cone = 5 cm
Slant height of the cone = 16cm

Formula Used:

Total surface area (TSA) of a cone = πr (r + l)

Solution: 

TSA of cone = π × 5 × (16+5)

= π × 5 × 21

= $$\frac{22}7 \times5\times 21$$

= 330 cm²