Sum of interior angles (n - 2) x 180: find the sum or a missing angle

1. A.
   $540^\circ$
2. B.
   $1440^\circ$
3. C.
   $720^\circ$
4. D.
   $900^\circ$

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1. A.
   $3240^\circ$
2. B.
   $3600^\circ$
3. C.
   $3060^\circ$
4. D.
   $3420^\circ$

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1. A.
   $1080^\circ$
2. B.
   $108^\circ$
3. C.
   $100^\circ$
4. D.
   $80^\circ$

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