How to plot a circle 3D surface area, using surf or mesh?

Good day,

Firstly, I did search online for how to plot, but either it is too advanced or does not fit my purpose.

I am trying to plot a simple 3D surface area where it will show a range of distance and height. Let's say a "safe zone". I would like it in a circle, where the radius is 1300 and its height is 800.

How do I go about it?

I tried something like this, but it gives me errors.

x = 0:5:1300;
y = x;
z = 0:5:800;
mesh(x,y,z)
or 
surf(x,y,z)

I did try to use also to perhaps use the surface area of a circle as a function, but failed as well.

x = 0:5:1300;
y = x;
[X,Y] = mesh(x);
F = pi()*X^2.;
surf(X,Y,F)

Thank you in advance,

Answer 1

[madhan ravi]

Perhaps see sphere() ? it gives a volumetric object though

[cancel077]

I need it to be half a sphere though/semi circle, with a range of "x" and a height of "y". That's why I tried this surface area, but didnt work.