Diameter of cone = d = 4mm
So,
Radius of cone = r = 2mm
Slant Height = l = 6mm
Surface Area = A = ?
The formula for the surface area of cone is:

Using the values, we get:

mm²
Therefore, the surface area of the cone with diameter 4mm and slant height of 6mm will be 16π mm²
Answer:
114
Step-by-step explanation:
The youngest child is 8 years old.
8 x 2 = 16
8 + 13 +15 +16 = 52
52 / 4 = 13
Answer: Pentagonal Prism
Step-by-step explanation: Pentagonal Prism the last one.