yuhei wrote:6. MATCHING PAIRS

My teammates would like to know the definition of "vertices" in this puzzle.

(For example, is it allowed that more than two vertices are placed on single line?)

In the example, the vertices are the four points that lie on the circumscribed circle. The actual puzzle will be similar enough.

In particular, the "complete picture" should be obvious.

Two objects are complements of each other if they can be placed on top of each other so that 1. together they form the complete picture, and 2. they don't share any line segments. (I.e., they only overlap in finitely many points.)