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1982 AMC 12 Question 6

AMC12 · 1982 AMC 12

Question 6

The sum of all but one of the interior angles of a convex polygon equals $2570^\circ.$ The remaining angle is
  1. $90^\circ$
  2. $105^\circ$
  3. $120^\circ$
  4. $130^\circ$
  5. $144^\circ$