Question

I’m stuck and I don’t know what to do someone help please

Answer 1

Explanation:

1.

`diameter = 6\:cm\\Radius = \:d/2\: =\: 6/2 = 3\:cm\\Height = 9\:cm\\\\Volume \:of\:a\:cone : (1)/(3) \pi r^2 h\\\\V = (1)/(3)* 3.14 * 3^2 \: * 9\\\\V = (1)/(3) * 3.14 * 9 * 9\\\\V = (254.34)/(3) \\\\Volume = 84.78cm^3`

2.

`diameter =\: 6\:cm\\Radius= d/2 = 6/2 = 3\:cm\\Height = 9\:cm\\Volume = ?\\\\Volume \:of\:a \:cylinder = \pi r^2 h\\\\V = 3.14 * 3^2 * 9 \\\\V = 3.14 * 9* 9\\\\Volume = 254.34\:cm^3`

3.

The volume of a cone is (one third) of the volume of a cylinder which has the same height as the cone and the same base radius as the cone.

So, you need 3 (three) volumes of cone to fill the cylinder.

Answer 2

For the second question, you’re finding the volume of a cylinder. The formula is V = (pi)(r^2)(h) so we will plug in what we know. Half of a diameter is the radius so 6/2 = 3. It says radius squared so 3^ 2 = 9. We can also see the height is 9 cm so plug that in. For all of these formulas, we must use 3.14 for pi so plug that in also.
V = (3.14)(9)(9)
V = 254. 34 cm cubed

I don’t have time to help with the other questions but I hope this helps you know how to use the cylinder volume formula