The input layer should be a point layer, in which there should be a point. The coordinates of this point should be the center of the circle (or wedge, or semi-circle). The default width of the wedge is 45°, or one-eight of a circle and the default azimuth of the wedge is 0°. The outer radius is what we are used to simply call a radius of a circle, and the inner radius variable will only be filled when we want to draw a ring or donut-like geometry.