An equilateral undecagon is an eleven-sided figure with equal side lengths.
Write a simplified expression for the perimeter of an equilateral undecagon
with side lengths of y in.

We can find r

Step-by-step explanation:

The law of sine also known as the sine rule, stipulates that the ratio of the length of a side of a triangle and the sine of the angle facing that side is a constant for all the sides of the triangle.

Mathematically, what this means is that;

r/Sin R = q/Sin Q = s/Sin S

Now, for this question, what do we have?

we have angle Q and the side facing it q

We also have angle R.

So the side we can find from here using the sine rule is no other than the side r.

We can find the length of side r from the triangle using the sine rule

And thus we have something like;

9.5/Sine 18 = r/Sine 135