The curved surface area and the slant height of a right circular cone are 858 cm2 and 13 cm respectively. Find its diameter (in cm).
Answer & explanation
Correct answer: option 1
The curved surface area of right circular cone = \(\pi \)rl
\(\frac{22}{7}\)× r × 13 = 858
r = \(\frac{858 × 7}{22 × 13}\)
r = 21
Diameter = 2r = 2 × 21 = 42 cm