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Never heard of a 'nanogon'. If you mean 'Nonagon'. note the spelling.

The the exteriod angle is

EXT Ang = 360 / 9 = 40 DEGREES.

Remember for any REGULAR polygon the EXTETRIOR Angle is '360' divided by the given number of sides (n).

Algebriacally.

Ext. Ang = 360 / n

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lenpollock

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3mo ago

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