Oval. It is called the Oval Office.
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The House Chamber http://www.house.gov/house/Visitor.shtml
Very small, typically a one room cabin.
It's oval because that way the president can hear everything. There are two points in an oval (or ellipse) called the focus point. In a room such as the oval office, when standing at one of these points you can hear everything that is happening in the room because sound is bounced off the walls/ceiling sending it all to those points (basic geometry). The president's desk is situated on one of those points meaning the president can hear whatever anyone is saying (even when whispering) so you can't "keep a secret" from the president in his office. The mason's designed it. Hope this helps
There are four in total. Three rooms, one of each floor in the main part are oval (or more accurately perhaps elliptical) . In addition there is the oval office in the West Wing.
A rotunda. Most atate capitals have a rotunda, but not all. One even has a dome, but no rotunda, because the dome is "false" and is not open to the building interior. A rotunda may also be any round room, such as the oval office of the White House.