How many sides does a regular polygon have each interior angle of which is measure 120

Which of the following transformations will always produce a congruent figure?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

Aschool had an election where the candidates received votes in the ratio 1: 2: 3. if the winning candidate received 210 votes, how many total people voted in the election?