Question

find the total surface area of a cone if its slant height is 21 m and diameter of its base is 24m​

Answer 1

Answer:

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Answer 2

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Question

• find the total surface area of a cone if its slant height is 21 m and diameter of its base is 24m.

$\sf{\bold{\red{\underline{\underline{Given:-}}}}}$

• Slant height of cone is 21 m.
• Diameter of base of is 24 m.

$\sf{\bold{\orange{\underline{\underline{To: Find:-}}}}}$

• Total surface area of cone.

$\sf{\bold{\purple{\underline{\underline{Solution:-}}}}}$

• Radius = Diameter/2

• = 24/2

• = 12

• Radius of cone is 12 m.

We know,

• Total surface area of cone = πr² + πrl

Where,

• r is radius of cone.
• l is slant height of cone.

Put r and l is formula :-

• π × (12)² + π × (12) × 21

• 22/7 × 12 × 12 × 22/7 × 12 × 21

• 3168/7 + 792

• 452.57 + 792

• 1244.57

Therefore,

Total surface area of cone is 1244.57 m².

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