What is the measure of an exterior angle a regular 18-sided polygon to nearest tenth?

To find the measure of an exterior angle of a regular 18-sided polygon, we can use the formula:

Exterior Angle = 360° / number of sides

In this case, the number of sides is 18, so:

Exterior Angle = 360° / 18 = 20°

Therefore, the measure of an exterior angle of a regular 18-sided polygon is 20 degrees to the nearest tenth.