Pls help with these questions!!!

Given that ot =5, xt=12, and ox= 13 is xy tangent to circle o at t? 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 : )

Which of the following circles have their centers in the third quadrant? check all that apply.