Round 325.49 to the nearest tenth place

Indicate the formula for the following conditions: p^c(n, r)=

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 : )

Which geometric principle is used to justify the construction below?