I dont understand when there's a cirlce and multiple lines crossing what all the rules are for the ratio's of the lines, I remember learning something was one third of something else ? But i dont remember specfically.
Hi Alexa. Are you talking about the median of a triangle? It is often discussed when the incenter of a circle inscribed in a triangle is discussed (the incenter is where the angle bisectors of the triangle intersect). But that's not where the 1/3, 2/3 comes from. The 1/3, 2/3 are the ratios of the segments when medians of a triangle intersect. Medians are from a vertex to the midpoint of the opposite side. I think that may be what you are referring to.
Hope that helps.