Question

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

Answer 1

Answer:

Formule pr put karo values answer aa jayega

Answer 2

Step-by-step explanation:

Right circular cone:

If a right angled triangle is revolved about one of the two sides forming a right angle keeping the other side fixed in position then the solid so obtained by segments is called right circular cone.

Slant height:

The length of the line segment joining the vertex to any point on a circular edge of the base is called the slant height of the cone.

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Given:

Diameter= 24m, (r) = 24/2 m = 12 m

Slant height (l) = 21 m

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

= 22/7 × 12 × (21 + 12)

= (22/7 × 12 × 33)

= 8712/7

= 1244.57 m²

Hence, the total surface area of a cone is 1244.57m²

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Hope this will help you....