Geometry terms

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Across
  1. 7. A shape with no sides or vertexs’
  2. 9. Two angles that equal to 180º
  3. 10. The perimeter of a circle
  4. 12. A shape with 4 sides
  5. 15. An angle more than 90º and less than 180º
  6. 17. A quadrilateral with two sets of parallel sides
  7. 19. The space in a 3D shape
Down
  1. 1. a quadrilateral with 4 congruent sides
  2. 2. When two shapes angles and sides are exactly the same
  3. 3. A 3D shape in which has 2 bases which are parallel to each other
  4. 4. A 3 sided shape, which all the angles add to 180
  5. 5. The space from one end of the circle to another
  6. 6. An angle more than 0º and less than 90º
  7. 8. 1/2 of the diameter
  8. 11. Two angles that equal to 90º
  9. 13. The space, measured in degrees, between intersecting lines
  10. 14. The space inside 2D shapes
  11. 16. A 3D shape in which there is 1 base and the shape meets at a vertex
  12. 17. a shape with 3 or more sides (not circles)
  13. 18. An angle that is exactly 90º