Surface Areas of a Cone

Surface Areas of a Cone

By Mr Winston Soo

Draw

Draw the net of a cone.

​Here is the net of a cone.

Curved surface area = ?

Total surface areas of a cone

Total surface areas of a cone

​Slant height, L

Let's cut the sector into many thin slices ...

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​What is the area of this rectangle?

Curved surface area = πrL

Total surface areas of a cone

​L

​= πr² + πrL

Multiple Choice

Which formula is used for calculating the volume of a cone?

• V = (1/3) * π * r² * h
• V = π * r² * (h + 1)
• V = π * r² * h
• V = (2/3) * π * r² * h

Multiple Choice

Which formula is used to calculate the curved surface area of a cone?

• CSA = 1/3πr^2h
• CSA = πrl
• CSA = 2πr^2
• CSA = πr^2h

Multiple Choice

Which formula is used to calculate the total surface areas of a cone?

• A = 2πr^2 + 2πrh
• A = 4/3πr^3
• A = πr(r + l)
• A = πr^2 + πrl