Originally Posted by

**Alyosha** Draw the figure, or sketch it.

(I don't know how to draw in computers so I will just describe it)

Draw it such that one of the 5 "star-points" is the topmost. Call that point, A.

Draw a vertical line segment from A to the center of the star (or of the circumscribing circle). Call that center, point O.

Draw a line segment from O to one of the bases (lower ends) of the isosceles triangle (the "star-point"). Call that end or "inside corner of the star" as point B.

Draw a horizontal line segment connecting the two lower ends of the star-point. Call the intersection of that line segment with AO as point C.

I'm not sure I understand this. AO runs from the topmost point of the star to the center, if draw a horizontal line segment connecting the two lower ends of the star-point, it doesn't intersect with AO as AO stops in the middle of the star.