Math

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Across
  1. 3. 四边形
  2. 5. 五边形
  3. 6. +
  4. 7. The branch of mathematics that deals with lines, angles, surfaces, and solids
Down
  1. 1. -
  2. 2. 六边形
  3. 4. 三角形
  4. 5. 多边形