CROSSWORD PUZZLE

1234567
Across
  1. 2. A way of arranging identical plane shapes so that they completely cover an area without overlapping.
  2. 5. In geometry, a figure of five sides and five angles.
  3. 6. A synonym of corner in mathematics.
  4. 7. A plane figure with four equal sides and four right angles.
Down
  1. 1. A figure whose sum of all the angles gives 180 degrees.
  2. 3. The pentagon tiles are all ....
  3. 4. Who founded the 15th type of pentagonal tiling.