Shapes and angles

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Across
  1. 4. The name of a triangle with 3 equal angles
  2. 5. If the angles sum to 360 degrees the shape has __ sides
  3. 6. The name given to a pair of lines that never touch
  4. 8. Another word used for "corner"
  5. 9. The name of a ten sided shape
  6. 11. The angles in this shape add up to 180 degrees
  7. 13. Reflex angle is 345 degrees, the acute is ___ to make a full circle
  8. 14. The name of a four sided shape
  9. 17. Angles less than 180 but greater than 90 degrees
  10. 18. Used to measure cm
  11. 19. If one angle on a straight line is 120 degrees, the other is
  12. 20. The amount of mm in one cm
Down
  1. 1. Angles around this add up to 360 degrees
  2. 2. Lines that cross at right angles
  3. 3. An angle less than 90 degrees
  4. 7. The units used when measuring angles
  5. 10. The equipment used when measuring angles
  6. 12. The number of degrees in a right angle
  7. 15. Angles greater than 180, less than 360 degrees
  8. 16. There are 100cm in one
  9. 19. The number of vertices a hexagon has