Line a passes through (2, 10) and (4, 13). Line b passes through (4, 9) and (6, 12).
Line c passes through (2, 10) and (4,9).
Determine which of the lines if any are parallel or perpendicular. Explain

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 : )