Question 1 is equilateral Question 2 is regular Question 3 I don't know because I don't have a graph and there isn't one in the picture. Question 4 Don't know because there is no graph. Question 5 Don't know because there is no graph. Sorry for the inconvenience of the graph stuff... But I hope what I did with 1 and 2 helped!!! -EmmyLou2020