Question:
Which of the following is the correct formula for Lateral Surface Area of a cone?
शंकु (cone) की पार्श्व सतह (Lateral Surface Area) का सही सूत्र कौन सा है?
Options:
- a) π r l
- b) π r (r + l)
- c) 2 π r l
- d) π r² + π r l
- a) π r l
- b) π r (r + l)
- c) 2 π r l
- d) π r² + π r l
correct answer : a)
Explanation:
Lateral Surface Area of a cone = π r l, where r is the base radius and l is the slant height. Total Surface Area = π r l + π r² = π r (l + r).
शंकु की Lateral Surface Area = π r l, जहाँ r आधार की त्रिज्या और l तिरछी ऊँचाई है। Total Surface Area = π r (l+r)।