Measuring the Angle of a Triangle with a Protractor (Question Illustrated by Image)

angletriangles

Forgive my ignorance, and teach me the correct way to read an angle when I am using a protractor. From the image below, would any of the two statements below be correct? If yes, which one? If neither, what would be the correct way to state the angle of the triangle of the chart?

Statements:

  1. Relative to March 18th, the triangle formed by the number of cases is roughly at a 30 degrees angle

  2. Relative to March 18th, the triangle formed by the number of cases is roughly at a 150 degrees angle

Protractor superimposed on a bars-chart visualization of the number of COVID-19 cases:

enter image description here

Thank you.

Best Answer

In general, the angle is taken as the smallest one, but I don't know if there is any agreement for the type of data you are using.

Edit: Thinking in angles of a triangle, that angle have to be less than $90°$, if not there is no triangle, because you already have an angle of $90°$.

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