Question

Which of the following formulas correctly calculates the surface area of a cone?(1 point)
Responses

2πrl+2πr2

2 pi r l plus 2 pi r squared

2πrl+πr2

2 pi r l plus pi r squared

πrl+2πr2

pi r l plus 2 pi r squared

πrl+πr2

Answer 1

πrl + πr^2

Reason: the lateral (curved) area is πrl and the base area is πr^2, so the total surface area = πrl + πr^2. (If they meant only the lateral area, it would be πrl.)