the language of geometry

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Across
  1. 2. A four sided flat shape with straight sides where all sides have equal length. Also opposite sides are parallel and opposite angles are equal
  2. 5. No sides are congruent
  3. 6. formed by two rays with the same endpoint
  4. 8. A line that intersect 2 or more lines in a plane
  5. 9. undefined flat surface
  6. 11. The part of a line consisting of one endpoint and all the points of the line on one side of the endpoint
  7. 14. Adds to 90°
  8. 16. polygon with eight sides and a 135° interior angle
  9. 17. All angles are less than 90°
  10. 20. The side opposite the right angle in a right triangle
  11. 21. Figures in the same plane
  12. 24. A conclusion reached by using inductive reasoning
  13. 26. lines vertical or horizontal to each other
  14. 28. One angle is larger than 90°
Down
  1. 1. a polygon with three edges and three vertices.
  2. 3. Four sided flat shape with straight sides where are all sides have equal length and every interior angle is a right angle 90°
  3. 4. A four sided flat shape with straight sides that have two pairs of sides each pair is made of two adjacent sides that are equal in length
  4. 7. A four sided flat shape with straight sides where opposite sides are parallel opposite sides are equal in length and a and b are same
  5. 10. Is the part of an if-then statement (conditional) that follows then
  6. 12. polygon with 6 sides and a 120° interior angle
  7. 13. formed by rays with a common endpoint
  8. 15. the part that follows if in an if then statement.
  9. 18. Points on the same line
  10. 19. A statement that is mathematically proven to be true for all cases.
  11. 22. a collection of points along a straight path that goes on and on in opposite directions
  12. 23. A four sided flat shape with straight sides where all interior angles are right angles 90° also opposite sides are parallel and of equal length
  13. 25. A four sided flat shape with straight sides that have pairs of opposite sides parallel the sides are parallel are called bases. That other sides are legs
  14. 27. A line, ray or segment from a vertex to the midpoint of the side of the triangle opposite of that vertex