A right circular cone has a height of 12 cm and a radius of 5 cm. Find its slant height and curved surface area.
Show answer & explanation
Correct answer: A
Explanation
given :
Height = 12 cm
radius = 5 cm
According to the formula:
Slant height = √(r² + h²)
Curved surface area = πrl
Slant height = √(5² + 12²)
= √(25 + 144)
= √169
= 13
Curved surface area = π × 5 × 13 = 65π
= 65 × (22/7) = 204.29
Slant height = 13 cm
Curved surface area = 204.29 cm²