The curved surface area of a right circular cone of base radius 21 cm is 594 sq. cm. What is the slant height of the cone?
Answer & explanation
Correct answer: option 3
We know that,
Curved surface area of cone = πrl
where l = slant height
We have,
Curved surface area of a cone = 594cm2
radius = 21 cm
Curved surface area = 594
π × r × l = 594
= \(\frac{22}{7}\) × 21 × l = 594
= l = 9 cm