Find The Slope of Three Points

SEE POST #9

Hello,
I need help with creating a formula that finds the slop (incline, gradient, angle) of three points. No sure how to phrase it. I’m not sure how to calculate this mathematically and hoped it could be done in Excel. What I most concerned with is the slop of point (C) compared to the other two points, with point (B) being the vertex.

I’m not sure if I’m explaining what I need well enough, so feel free to ask questions. The attached spreadsheet has the values and the order they are in.


Thank you in advance for any and all help.