Angles are made up of straight lines. Straight lines are different on a log-linear graph, compared to a straight linear graph.
Therefore, if you're interested in angles OR (straight) trendlines, you better be clear about which type of chart you're using.
I believe engineers do refer to log-linear graphs as being "semi-log", as distinct from "log-log" which have logarithmic variables on both axes.
Cheers.
And peace to all, especially the doom and gloom merchants I have on "Ignore".
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