How can i draw a circle pie?

Hi! With center an object i want to draw a circle pie from start position to end position so that when i move one of the two points ( start position or end position) the circle pie gets bigger or smaller. (not on Canvas but on 3d space). Can someone help me?

Well you can use blender to first make a ring in the add area then make a cube rotate it until it is like the angle you want it to be and the ring is supposed to be up to to y coordinates on degrees and put it at 90 I think then the cube will be like 45x and the scale is 0.1 0.1 and the last one is 1m z is up y and x is left right up and down:

Sorry but I did not understand any thing from what you write… I am New in unity…