European Flag tutorial fine until sine/cosine? Huh?

I am trying to learn Inkscape, but the European Flag instructions are useless at the point shown below.

"Next, select the original star and make a new Clone. This time move the Clone 60 pixels down (−60). Repeat for the Horizontal (x) direction. For the rest of the stars, use the eight permutations of x(y) = ±30 and y(x) = ±52 pixels (60 times the sine and cosine of 30°, respectively)...."

What the heck does that mean? I have no idea what the eight so-called permutations are, or how they should be shown in the "Move" dialog box. You very nicely provide examples of everything but these and unless you have mathematics beyond high school algebra, how in the heck are you going to make that circle of stars.

Never mind....I found the answer on Ubuntu website:
Quote: > Permutations:
 >
 > 1 x = 30 (60px x sin( 30° )) y = 52 (60px x cos( 30° ))
 > 2 x = 30 y = -52
 > 3 x = -30 y = 52
 > 4 x = -30 y = -52
 > 5 x = 52 y = 30
 > 6 x = 52 y = -30
 > 7 x = -52 y = 30
 > 8 x = -52 y = -30