geometry vocabulary

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Across
  1. 3. They are four-sided shapes
  2. 4. all angles are acute in a triangle
  3. 5. a seven-sided polygon
  4. 7. two sides of a triangle are equal
  5. 11. a straight line connecting two points on the edge of a circle
  6. 12. an angle formed inside a polygon where two sides meet
  7. 14. perimeter of a circle
  8. 15. straight line joining two points on the circumference of the circle
  9. 16. triangle where one of the interior angles is more than 90 degrees
  10. 18. triangle that has one 90-degree angle
  11. 20. any angle that is above 180 degrees
Down
  1. 1. an angle that equals 360 degrees
  2. 2. Triangle where no sides or angles are congruent
  3. 6. quadrilateral that has two sets of parallel sides and no angles are 90 degrees
  4. 8. Two angles whose sum is 180 degrees
  5. 9. Two angles whose sum is 90 degrees
  6. 10. distance from the centre to the circumference of a circle
  7. 13. part of a circle surrounded by two radius
  8. 17. a line that touches a circle at one point from the outside
  9. 19. Polygon that has 10obtuse