Question 40
Mensuration of SolidsA sector is cut off from a circle radius 8.2cm to form a cone, if the radius of the resulting cone is 3.5cm, calculate the curved surface area of the cone. (Take π = 22/7)
- A.11.25cm2
- B.12.83cm2
- C.22.0cm2
- D.67.2cm2
- E.90.2cm2
Show the answer and explanation
Answer: E (90.2cm2)
Explanation
The circle's radius becomes the slant height l = 8.2 cm. Curved area = πrl = 22/7 × 3.5 × 8.2 = 90.2 cm².