edited by
428 views
0 votes
0 votes

Each side of a given polygon is parallel to either the X or the Y axis. A corner of such a polygon is said to be convex if the internal angle is $90^{\circ}$ or concanve if the internal angle is $270^{\circ}$. If the number of convex corners in such a polygon is $25,$ the number of concave corners must be

  1. $20$
  2. $0$
  3. $21$
  4. $22$
edited by

Please log in or register to answer this question.

Related questions

0 votes
0 votes
0 answers
3
0 votes
0 votes
0 answers
4