N is for normal #AtoZChallenge

For the A to Z in April Challenge 2019 I have picked some words, which are connected with physical space.

N is for normal –
A mathematician’s right angle
Ninety degrees sounds more formal:
How a plumb-line would dangle.

Although I am not naturally a neat writer, I enjoyed learning about geometry. We had to use a sharp pencil and a pair of compasses to construct various angles. Perhaps our first exercise was to bisect a line by constructing another line at right angles to it. We also learned how to construct an equilateral triangle with its 60° angles. That makes a connection between this post and my posts for letter E and letter T.

Some 90° angles and wallpaper with vertical stripes

A plumb-line is used to find the vertical. Plumb-lines are useful for jobs including hanging wallpaper (with or without vertical stripes). The prophet Amos had a vision of a plumb-line.

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