Final answer:
The total angle measure of an 18-gon is calculated using the formula (n - 2) × 180 degrees. For an 18-gon, this equals 2880 degrees, which isn't among the provided options, indicating a possible error in the choices given.
Step-by-step explanation:
To find the total angle measure of an 18-gon (18-sided polygon), we use the formula for the sum of interior angles of a polygon, which is given by (n - 2) × 180 degrees, where n is the number of sides in the polygon. For an 18-gon, we simply plug in n = 18 into the formula and calculate:
(18 - 2) × 180 degrees = 16 × 180 degrees = 2880 degrees.
An 18-gon is a polygon with 18 sides. To find the total number of angle measures in an 18-gon, we can use the formula (n - 2) * 180, where n represents the number of sides. Substituting n = 18 into the formula, we get (18 - 2) * 180 = 16 * 180 = 2880 degrees.
Therefore, the total angle measure of an 18-gon is 2880 degrees, which is not one of the options provided. It appears there might be a mistake in the list of possible answers.
Therefore answer is A) 1620 degrees.