help please i still mix the formulas
$\endgroup$3 Answers
$\begingroup$Hint:
The inner angles of an $n$-gon add up to $(n-2)\pi$
From there, can you find $x$?
$\endgroup$ 5 $\begingroup$For an $n$-sided polygon, the sum of the interior angles is $180(n - 2)$. So I suggest that you try adding up all of those angle measures, setting it equal to $180(n - 2)$, and then solve for $x$. Afterwards, you'll just need to plug that value of $x$ into the angle measure of $E$.
$\endgroup$ $\begingroup$Try splitting the nonagon (the 9-sided polygon in the diagram) into triangles. If a triangle has $180^\circ$, a rectangle $360^\circ$, and a pentagon $540^\circ$, how many degrees would a nonagon have? are the angles measured in degrees or radians?
