..just the circumference of the circle that makes up the cylinder. c=2*pi*r
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A round bath is a cylinder. The volume of a cylinder = area of the base x perpendicular height. Area of the base is πr2 (pi x radius x radius). The radius is half the diameter. The diameter is the width of the circular base. The perpendicular height will be the depth of the water, whether it's up to the top or up to where you have a bath.
Yes, prisms are always 3D. It is described by taking a shape and stretching it linearly (in a straight line) so that the shape at the base is perpendicular to the sides. Also, if the stretch was "up", the top would be the exact same shape as the base. For instance, a circle stretched is a cylinder, a rectangle stretched is a box ("box" is lay term for "rectangular prism" as in "Could you pass me that rectangular prism of cereal?"). You can also stretch a line, but a line is not a shape, so the result would not be a prism. Btw, stretching a line would give you a plane; vert 2D.
A cone would fit the given description
You can make a tube (or pipe) by using a rectangle and bending it around on itself. With two circles, you can close of each end of the tube to make a cylinder.
A microscope is typically shaped like a tube, with a base to support it. The top of the tube houses the lens and the eyepiece where the viewer looks through. Some microscopes may have additional attachments or features but the basic shape is usually cylindrical.
A liquid takes up the shape of a container without its volume changing.
1 rectangle and 2 circle.
cone
..just the circumference of the circle that makes up the cylinder. c=2*pi*r
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A cylinder is a 3-Dimensional geometric shape that resembles a tube, only a cylinder has no open ends. For instance, if you were to take a paper towl roll and cap off both ends with 2 flat circles, you would end up with a cylinder.
The metal that can be beaten up into a shape is known as malleable metal. It is also said to be ductile which makes it possible to beat it into shape.
Cut sandstone
Sounds like you have an older 4 cylinder car. I had a Pontiac 2000 4 cylinder that did that.
Calculate volume of entire cylinder, then divide answer by 2.