Pls help what's 9 divided by 7432

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.

This is a map of the mars exploration rover opportunity predicted landing site on mars. the scale is 1cm : 9.4km. what are the approximate measures of the actual length and width of the ellipse? i mostly need to know how to set it up : )

Proportions in triangles solve for x