4
412
8
812
Correct answer is A
A regular has all sides and all angles equal. If each interior angle is 140° each exterior angle must be
180° - 140° = 40°
The number of sides must be 360o40o = 9 sides
hence 2k + 1 = 9
2k = 9 - 1
8 = 2k
k = 82
= 4
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