Which drawing can be assembled from all the pieces? You may turn pieces, but may not flip, stretch or overlap them. Lines inside each choice show the edges between pieces.
- A
- B
- C
- D
Show answer and method
Answer: D
Match the two bent inner edges of each numbered piece, then trace their outer edges around the outline. In the correct assembly every source piece keeps its angles, edge lengths and handedness. Each other choice moves the inner junction, changing the adjoining pieces: rotating a piece cannot move a corner relative to its other corners.