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225 degrees

The total external angle of any polygon is

(2n+4) x 90 degrees, where n is the number of nodes.

eg

Total external angle of an octogon:

=((2x8)+4) x 90

=(16+4) x 90

=20 x 90

=1800 degrees.

Each node has an external angle of 1800/8 = 225deg.

Incidentally, the total internal angle for any polygon is (2n-4)x90

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13y ago

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