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The diameter of base of a right circular cone is 20 cm and its slant height is 10.5 cm. What is the curved surface area (in cm2) of the right circular cone? [Use π = \(\frac{22}{7}\)]

The diameter of base of a right circular cone is 20 cm and its slant height is 10.5 cm. What is the curved surface area (in cm2) of the right circular cone? [Use π = \(\frac{22}{7}\)] Correct Answer 330

Given:

The diameter of the base of a right circular cone is 20 cm and its slant height is 10.5 cm

Concept used:

Diameter = Radius × 2

Curved surface area = πrl

where r = radius of the base and l = slant height

Calculation:

The radius of the base of a right circular cone = 20 ÷ 2 = 10 cm

Hence, the curved surface area of the right circular cone

⇒ π × 10 × 10.5

⇒ 330 cm2

∴ The curved surface area of the right circular cone is 330 cm2.

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