Answer:
D) Surface area of cone = [tex]54 *\pi[/tex] units² .
Step-by-step explanation:
Given : A cone of slant height 15 units and radius 3 units.
To find : What is the surface area of the right cone.
Solution : We have given that
Slant height ( l) = 15 units.
Radius = 3 units.
Surface area of cone = [tex]\pi* radius ( radius + slant height )[/tex].
Surface area of cone = [tex]\pi* 3 (3 + 15 )[/tex].
Surface area of cone = [tex]\pi* 3 (18)[/tex].
Surface area of cone = [tex]\pi* 54[/tex] units² .
Therefore, D) Surface area of cone = [tex]54 *\pi[/tex] units² .
