geometry vocab

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Across
  1. 1. being the same or equal distance
  2. 4. an angle that is equal to 180 degrees
  3. 7. the point at which the three perpendicular bisectors of the sides of a triangle intersect and which is the same distance fro
  4. 9. when it moves and changes orientation and position while keeping its shape and size constant
  5. 10. a triangle that has all its sides equal in length
  6. 11. drawing lines, line segments, shapes, circles and other figures accurately using a ruler, a compass, or a protractor
  7. 14. The distance from the centre of a circle to any point on the boundary
  8. 17. the middle point of a line segment
  9. 18. a part of a straight line that is bounded by two distinct end points, and contains every point on the line that is between its endpoints
  10. 19. 90 degrees
  11. 20. a list of Statements and Reasons used to prove that a given mathematical concept or idea is true
  12. 24. If two lines are cut by a transversal so that the alternate interior angles are congruent, then the lines are parallel
  13. 25. angles with a measurement of zero degrees or zero radian
  14. 26. two angles whose measures add up to 90°
  15. 29. through any given point not on a line there passes exactly one line parallel to that line in the same plane
  16. 30. those angles that sum up to 180 degrees
Down
  1. 2. two angles are adjacent if they have a common side and a common vertex
  2. 3. a statement to be proved
  3. 5. the angles that lie opposite to each other when two lines intersect
  4. 6. a line that divides a line or an angle into two equivalent parts
  5. 8. when an object is rotated on its own axis, the shape of the object looks the same
  6. 12. when two parallel lines are cut by a transversal, then the resulting alternate interior angles or alternate exterior angles are congruent
  7. 13. are coplanar infinite straight lines that do not intersect at any point
  8. 15. the intersection point of all the three interior angle bisectors of the triangl
  9. 16. if they have the same shape and size, or if one has the same shape and size as the mirror image of the other
  10. 21. an angle that is equal to 180 degrees
  11. 22. all sides of this triangle are equal
  12. 23. two lines that meet or intersect each other at right angles
  13. 27. the set of all points in the plane that are a fixed distance (the radius) from a fixed point (the centre)
  14. 28. the points that lie on the same straight line or in a single line