Introduction to patch function in MATLAB to draw objects 

Thanks a lot Linnea, u solved the actual problem.

you should build a figure from trigonometric functions, apply some function or matrix transformations to get the desired shape, and then build the patch over those geometries

there are too many ways to do that, in my case, my teacher teach us in another but similar way, something a bit more sofisticated and automatic, so, the way you build a figure in MATLAB depende in most cases of your imagination and the basic knowledge of geometry and how works every MATLAB tool

I don't know.

Example, patch([0,3,3],[0,0,2],[0,0,0], 'blue') Just leave out one of the vertices.

박근웅 there is a microphone in the bottom-right corner of the screen. Perhaps your computer has weak speakers.