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i am the visible reminder of this invisible thing. we are the same, yet different. what am i?

Aperpendicular bisector, cd is drawn through point con ab if the coordinates of point a are (-3, 2) and the coordinates of point b are (7,6), the x-intercept of cd is point lies on cd.

Solve for n? [tex]z = \frac{3}{4} mn[/tex]

Can someone me with these two circle theorem questions asap?