Regular polygon: a relation between interior and exterior angles given, find the number of sides or the angle

1. A.
   Hexagon
2. B.
   Octagon
3. C.
   Nonagon
4. D.
   Decagon

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1. A.
   $n$
2. B.
   $\frac{n-1}{2}$
3. C.
   $\frac{n-2}{2}$
4. D.
   $\frac{2(n-2)}{3}$

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1. A.
   12
2. B.
   16
3. C.
   18
4. D.
   20

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1. A.
   $110^\circ$
2. B.
   $120^\circ$
3. C.
   $130^\circ$
4. D.
   $140^\circ$

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1. A.
   9
2. B.
   10
3. C.
   11
4. D.
   12

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