Math Crossword Puzzle

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Across
  1. 2. Degrees of a right angle.
  2. 4. The distance around a square.
  3. 7. A 3-sided flat shape with straight sides.
  4. 9. 5-sided shape
Down
  1. 1. 3 x 5 =
  2. 3. The top number in a fraction.
  3. 5. Triangle with all sides equal.
  4. 6. A part of a line with a start point but no end point.
  5. 8. 20 divided by 5
  6. 10. x - 3 = 7