The total surface area of a right circular cone is 704 cm². If the radius of the cone is 7 cm, find the slant height. (Use π = 22/7)
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e 25 cm.
Total Surface Area of cone = πr(l + r), where l is the slant height
⇒ 704 = (22/7) × 7 × (l + 7)
⇒ 704 = 22 × (l + 7)
⇒ 704 ÷ 22 = l + 7
⇒ 32 = l + 7
⇒ l = 32 - 7 = 25 cm