Answer:
<h2>12.56 m</h2>
Step-by-step explanation:
The formula of a circumference of a circle:

<em>d</em> - <em>diameter</em>
<em />
We have <em>d = 4m</em>.
Substitute:

Use 3.14 for π:

Set 7x-4 and 31 equal to each other
7X-4=31
Add four to both sides
7X=27
X=3
The answer is D
Since the radius is the same but the height changes, the volume would change by the multiple of the height.
In this case the volume of the larger cone would be 4 times as large as the smaller cone so you would need 4 small cones
I got this on the calculator.