How to spell the puzzle on page 10 1 in the second volume of senior one mathematics?

1, cross: put several boards horizontally, with three small squares on each board, and one * * * with nine small squares.

2. Crescent Moon: Take the cross as the center and put four boards, each with three small squares and eighteen small squares.

3. Hexagon: Take the crescent as the center, and put six wooden boards, each with three small squares and one * * * 24 small square.

4. Heart-shaped: centering on the hexagon, six boards are placed on each board, and three small squares and one * * * 36 small squares are placed on each board.

5. Octagonal shape: centered on the heart, each board has eight boards, each board has three small squares, and one * * * has forty-eight small squares.