supermanaccz

The sin of an angle is its opposite side over the hypotenuse.

Using Pythagorean we could solve for AC.

20^2-16^2=x^2 

x = 12

Now we could plug in our values,

Sin B = 12/20

The simplified fraction is:

3/5

The sum of all the exterior angles in any polygon is always 360 degrees. 

Because the number of sides in a polygon is equal to the number of exterior angles, I can say that the number of exterior angles is x, which also means that there are x sides. 

40x = 360

x = 9

This is a nine sided regular polygon!

I hope this helped, 

Supermanaccz

Here is another example:

1/9 = 0.1111...

2/9 = 0.2222...

7/9 = 0.7777...

9/9 = 0.9999... = 1

So actually 0.999... = 1 

So we could use this in your question, 9.999r = 1 

So 3.3333r * 3 = 9.999999... = 9 + 0.99999... = 9+1 = 10

Basically your anniversary is my birthday!

I just noticed something very funny!

You joined the site, on March 13, which also happens to be my birthday!

Or maybe the answer is wrong 

Thank you so much!

I got it, but you can answer anyways. 

Okay!

Here we go!

We do subtraction

9*10^(-5)-3*10^(-6)

This is 87/1000000

Huh, that’s what I got too, but the answer says 202, weird...