Answer:

Step-by-step explanation:
The total surface area of a cone is given by :

Put r = 2r and l = 2l in the above formula

Hence, the total surface area of the cone is
.
Answer:
The fourth one.
Step-by-step explanation:
I am pretty sure.
Answer:
12
Step-by-step explanation:
Please mark me as brainlyest
The answer is going to be x=7