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
.
The triangle ADC and the triangle CDB are similar. Therefore:
Answer: A 4.5
Answer:
Doodoo
Step-by-step explanation:
doodoo
Answer:
a=16
Step-by-step explanation:
16/4+2 = 6
Thus the answer is 16
Answer:
a. $25.20
b. $445.20
Step-by-step explanation:
$420*(6%/100%) = $25.20
$420+$25.20 = $445.20