find the curved surface area of a cone whose area of base and height of 154 cm square and 24 cm respectively
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Answer:
CSA =484cm²
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Given :-
- Area of the base of a right circular cone = 154 cm²
Find :-
- Curved surface area = ?
Solution :-
We know the formula :- πr²
➤ πr² = 154 cm²
⇒ (22/7) × r² = 154
⇒ r² = 154 × (7/22)
⇒ r² = 7 × 7
⇒ r² = 7²
⇒ r = 7 cm
Now , we got the radius of the base = 7 cm
Therefore , then
As we all know , = l² = h² + r²
So we consider the slant height be l cm
- l² = h² + r²
Now, putting the values in the above formula
⇒ l² = (24)² + (7)²
⇒ l² = 576 + 49
⇒ l² = 625
⇒ l² = 25²
⇒ l = 25 cm
Now Slant height is 25 cm
So C.S.A of cone = πrl
⇒ (22/7) × 7 × 25
⇒ 22 × 1 × 25
⇒ 22 × 25
⇒ 550 cm ²
Hence ,
Curved surface area is 550 cm²
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