For this case we have that by definition, the surface area of a cone is given by:

Where:
A: It's the radio
s: It's the slant
Substituting according to the data we have:

If we round:

Answer:
True
The total possibility that the head and even no on dice appears is 3. and total possible choice are 12 {head ---> (1,2,3,4,5,6) & tail ---> (1,2,3,4,5,6)}. so the probability is 3/12= 1/4.
C: 1/4
Answer:
D
Step-by-step explanation:
False because you can subtract your way out of the set of whole numbers