How many quadrants does the Cartesian plane have?

How many quadrants does the Cartesian plane have?
  1. $2$
  2. $3$
  3. $4$
  4. $8$

Solution

The two axes divide the plane into four parts, called quadrants, numbered I, II, III and IV in the anticlockwise sense starting from the upper-right.

Asked in: IMO

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