Please help me with this math problem, I can't figure it out!

Answer:
c. 3769.91 mm³
Step-by-step explanation:
Data
We are asked to find the volume of the icicle, which is computed with the following formula:
V = (1/3)*B*h
where B is the base of the cone, which is calculated as follows:
B = (π/4)*D²
Replacing it into the previous equation, we get:
V = (1/3)*(π/4)*D²*h
Replacing with data:
V = (1/3)*(π/4)*12²*100
V = 3769.91 mm³
Answer:
3769.91 mm³
Step-by-step explanation:
The shape of icicle is a cone and the cone is inverted . The amount of frozen water in the cone is the volume of the cone.
The volume = 1/3Bh
where
h = height
B = base area
v = 1/3 × πr² × h
r = diameter /2
r = 12/2 = 6 mm
h = 100 mm
v = 1/3 × 36π × 100
v = 1/3 × 36 × 22/7 × 100
v = 79200/21
v = 3769.91 mm³
v = 3769.91 mm³