How many corners did president hoover's office have?

It had 0 corners

Explanation:

The White house has a single main presidential office that is passed on from one president to the next. This office has been given the name "The Oval Office". This is because the office was built in a rounded oval shape with 0 corners. Just like every other president, this is the same office that President Hoover used during his time as the President of the United States.

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the answer should be a. the sui empire, the tang empire extended from korea in the west to manchuria in the east.