Find eqn of cylinder of height

The equation describes all points on the circular base of the cylinder, and the inequality limits the height.In summary, the equation of the cylinder with base x^2+y^2=4 and height from z=0 to z=2 cannot be combined into a single equation. The equation describes all points on the base, while the inequality limits the height.
  • #1
DryRun
Gold Member
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4

Homework Statement


How to find the equation of cylinder: [itex]x^2+y^2=4[/itex] from z=0 to z=2?

Homework Equations


[tex](x-a)^2+(y-b)^2=r^2[/tex]

The Attempt at a Solution


I can't figure out how to implement the z-coordinate into the general equation of cylinder. In the latter, the height is taken as infinite in both opposite directions (upward and downward).
 
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  • #2
sharks said:

Homework Statement


How to find the equation of cylinder: [itex]x^2+y^2=4[/itex] from z=0 to z=2?

Homework Equations


[tex](x-a)^2+(y-b)^2=r^2[/tex]

The Attempt at a Solution


I can't figure out how to implement the z-coordinate into the general equation of cylinder. In the latter, the height is taken as infinite in both opposite directions (upward and downward).
Doesn't this work?
[itex]x^2+y^2=4; 0 \leq z \leq 2[/itex]
 
  • #3
Hi Mark44! :smile:

Actually, that's how the equations are originally given in the problem but i was wondering if there is a way to combine those 2 into a single equation, since the height of the cylinder is known.

In my mind, maybe something like that: [itex]x^2+y^2 + (z-c)^n=4[/itex] even though it's now become closer to a sphere!
 
Last edited:
  • #4
No, there's no way to combine the equation and inequality into one.
 

Related to Find eqn of cylinder of height

1. How do you find the equation of a cylinder of given height?

To find the equation of a cylinder of given height, we use the formula V=πr^2h, where V is the volume, r is the radius, and h is the height. This formula represents the relationship between the volume and the dimensions of a cylinder. By rearranging the formula, we can solve for r, which will give us the radius of the base of the cylinder. The equation of the cylinder is then (x-h)^2 + y^2 = r^2, where (x,y) represents any point on the base of the cylinder.

2. Can the height of a cylinder be negative?

No, the height of a cylinder cannot be negative. Since height is a measurement of distance, it cannot have a negative value. However, the height can be zero, which would result in a cylinder with no volume and just a flat base.

3. How is the equation of a cylinder related to its shape?

The equation of a cylinder is related to its shape because it represents the relationship between the volume and the dimensions of the cylinder. Any changes in the values of the radius or height will result in a different equation, thus creating a different shape of the cylinder.

4. Can the equation of a cylinder be used to find its surface area?

Yes, the equation of a cylinder can be used to find its surface area. By using the formula SA=2πrh+2πr^2, where SA is the surface area, we can plug in the values for the radius and height to calculate the total surface area of the cylinder.

5. How can the equation of a cylinder be used in real-life applications?

The equation of a cylinder can be used in various real-life applications, such as calculating the volume and surface area of cylindrical objects like cans, pipes, and containers. It is also used in engineering and architecture to design and construct cylindrical structures, such as towers and columns.

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