6. Choose the correct answer. Find the measure of each exterior angle of the regular nonagon. $1620^{\circ}$ $140^{\circ}$ $1260^{\circ}$ $40^{\circ}$ $360^{\circ}$

Step 1 ：A nonagon is a polygon with 9 sides.

Step 2 ：The formula to find the measure of each exterior angle of a regular polygon is \(\frac{360}{n}\), where n is the number of sides.

Step 3 ：In this case, n=9.

Step 4 ：Substitute n=9 into the formula: \(\frac{360}{9} = 40.0\)

Step 5 ：Final Answer: The measure of each exterior angle of the regular nonagon is \(\boxed{40^{\circ}}\)