3x+x= 180°(straight angle)
4x= 180°
x= 180/4
x= 45°
I’m not sure what the rule would be in this context, but those are just the squares of decreasing numbers starting at 10. It’s 10^2, then 9^2, then 8^2, and so on.
Kilogram
decagram
gram
decigram
milligram
3/1 is your slope for that