Question

find the sum of the interior angle measures of a convex nonagon (a nine - sided polygon). sum of the interior angle measures = (circ)

Explanation:

Step1: Recall the formula

The formula for the sum of interior - angle measures of a polygon is $(n - 2)\times180^{\circ}$, where $n$ is the number of sides of the polygon.

Step2: Identify the value of n

For a non - agon, $n = 9$.

Step3: Calculate the sum

Substitute $n = 9$ into the formula: $(9 - 2)\times180^{\circ}=7\times180^{\circ}=1260^{\circ}$.

Answer:

$1260$