By factor 81 is the surface area of the cone multiplied.
The answer is option D 81.
What is the surface area of the cone?
- The surface area of a cone is A=πr(r+h2+r2)
- Since the surface area is proportional to the square of the radius
Area ∝ r²
Upon multiplying by a factor 9 the surface area become multiplied by a factor 81.
Learn more about the surface area here:https://brainly.com/question/16519513
#SPJ2
