Find the perimeter of the shape

Find the constant of variation for the relation and use it to write an equation for the statement. then solve the equation.

Icould really use some with this question.

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 : )