Q: What is the sum of the external angle measures of a 18-sided polygon?

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1440 degrees

1440 degrees

A regular polygon

1800 degrees

A polygon with interior angle measures of 108 would be a pentagon

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The external angles of a polygon total 360° . Therefore each external angle of a regular decagon measures 360/10 = 36° Therefore each INTERNAL angle measures 180 - 36 = 144°

1440 degrees

1440 degrees

1800 degrees

A regular polygon

yes.

A polygon with interior angle measures of 108 would be a pentagon

Providing that it is a regular polygon then each exterior angle measures 24 degrees and each interior angle measures 156 degrees

Yes, a pentagon is a polygon, whatever the measures of its angles.

1440 degrees

If a dectagon is another word for a decagon then this is a 10 sided polygon. No matter how many sides it has, the sum of the external angles of a convex or regular polygon is 360°.

Right angle not polygon. (i'm not mad).