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Each interior angle measures 160 degrees

Q: What is the measure of one interior angle of a regular 18-sided polygon?

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A regular hexagon.

6

A regular decagon, or 10-sided polygon, has interior angles of 144

180 sides!

No. To elaborate, the smallest regular polygon, an equilateral triangle, has 60 degree interior angles. The next larger one, a square, has 90 degree interior angles. In fact, for any regular polygon, the interior angles measure 180*(n-2)/n degrees, where n is the number of sides. No polygon has less than 3 sides. Thus, no regular polygon can have interior angles less than 60 degrees.

Related questions

A regular polygon having an interior angle measure of 168o has 30 sides and is called a triacontagon.

Only if the polygon is "regular".

Only when it is a regular polygon that all interior angles are of equal measure

If the measure of an interior angle of a regular polygon is 140o, the polygon is a nonagon (sometimes called an ennagon) having 9 sides.

A pentagon (five sided regular polygon) has interior angles of 108°.

The measure of each interior angle of a fifteen sided regular polygon, a pendedecagon, is 156o.

A 13 sided regular polygon

The interior angle of an octdecagon, an 18 sided regular polygon, is 160o.

A regular polygon with 4 sides is a square. The measure of any interior angle of a square is 90 degrees.

A regular hexagon.

Only if the polygon is a "regular" one.

Only when the polygon is a regular convex polygon. Such as an equilateral triangle, or a square, or a regular pentagon.