Amanda's voice could be heard in the farthest corners of the assembly hall?
In the Early Republic the senators were patricians. By the Mid Republic the plebeians gained access to it. The Assembly of the Tribes was an assembly people (populus). All Roman citizens could vote in this assembly. If an individual patrician served in the cavalry, he could vote in the Assembly of the Soldiers. The plebeians had their own assembly, the Plebeian Council. Patricians were barred from this council.
It depends on which arrows you mean. You could be referring to the arrows at the ends of the scrollbars enabling you to scroll up and down or left and right. You could be referring to arrows in the groups on the ribbons, allowing you to extend out to more options on a dialog box. You could be referring to the triangles in the corners of cells that can indicate things like comments or errors.
First, I'm assuming the by corners, you mean verticies. Second, the answer depends on what you mean by "three dimensional triangle. To some, this could be interpreted as a pyramid. However, I think it is more likely that you are referring to a triangular prism- a prism shape with a triangle as each base. In this case, there are six "corners". Each side has three, where the length-wise edges of the prism intersect the verticies…