each side of a given polygon is parallel to either the x-axis or the y-axis. A corner of such a polygon is said to be convex if the internal angle is 90 or concave if the the internal angle is 270. If the number of convex corners in such a polygon is 25, the number of concave corners must be..CAT 2003(LEAKED)Explanation needed..

1) 20
2) 0
3) 21
4) 22

• 25-4=21
  
  Because convex corners will always be 4 more than concave corners.
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