Page 2 - WS2
P. 2
Observation
1. Base of parallelogram = x length of sector OAB =
× =
2. Altitude of parallelogram = slant height of cone = l
3. Area of parallelogram = x l= Curved surface area of cone.
4. Total surface area of cone = + area of circular base of cone.
= +
= (l+r)
Learning Outcome
Students will learn the concept to differentiate between the curved surface area and total
surface area of a cone.
Activity Time
1. Find lateral surface area of a cone in figure given.
2. Find total surface area of a cone in figure given.
