Geometry Crossword Puzzle

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Across
  1. 2. a straight line that joins any two points on the circumference of a circle
  2. 4. a triangle with all three angles less than 90°
  3. 6. a straight line that passes through the centre of the circle and connects two points on the circumference
  4. 7. a four sided shape with two pairs of parallel sides
  5. 10. the distance all the way around the circle
  6. 12. it has two pairs of adjacent equal sides
Down
  1. 1. a triangle with an angle greater than 90°
  2. 3. the opposite sides are equal and parallel and all angles are 90°
  3. 5. it has four equal sides and four right angles
  4. 8. a curved part of the circumference between two points on a circle
  5. 9. it has three unequal sides and three unequal angles
  6. 11. a straight line from the centre of the circle to any point on the circumference