How to find the surface area of a cone

The video tutorial explains how to calculate the surface area of a cone. It begins with finding the area of the base, which is a circle, using the formula pi r squared. The tutorial then introduces the formula for the lateral area of a cone, which is pi times r times l, where l is the slant height. The instructor demonstrates how to plug in the values for r and l to calculate the total surface area. The final result is calculated using a calculator, and the importance of including units, specifically squared centimeters, is emphasized.

What is the formula for the area of the base of a cone?

• pi r squared

• 2 pi r

• pi r l

• pi r cubed

Which formula represents the lateral area of a cone?

• pi r squared

• pi r cubed

• pi r l

• 2 pi r

In the formula for lateral area, what does 'l' represent?

• Height

• Slant height

• Diameter

• Radius

If the radius of a cone is 4 and the slant height is 10, what is the total surface area?

• 200 square centimeters

• 150 square centimeters

• 100 square centimeters

• 175.9 square centimeters

Why is it important to include units when calculating area?

• To ensure accuracy

• To avoid confusion with volume

• All of the above

• To indicate the type of measurement