Geometry lessons 1-5

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Across
  1. 2. interior the angles formed when a transversal intersects two coplanar lines
  2. 4. when both the hypothesis and conclusion are negated
  3. 6. lying on the same plane.
  4. 8. the opposite of a given mathematical statement
  5. 10. The converse of a conditional statement is created when the hypothesis and conclusion are reversed
  6. 12. a flat surface of two dimensions
  7. 13. Hypotenuse leg
  8. 14. a proposition that is consistent with known data, but has been neither verified nor shown to be false.
  9. 16. a triangle in which all three sides are in different lengths, and all three angles are of different measures.
  10. 17. points that lie on the same straight line or in a single line
  11. 19. a line that passes through two very specific points on a triangle: a vertex, or corner of a triangle, and its opposite side at a right, or 90-degree, angle
  12. 20. a statement arrived at by applying a set of logical rules
  13. 23. a straight marking
Down
  1. 1. the end of a line
  2. 3. a triangle that has all its sides equal in length.
  3. 5. Numerical measure of a line's inclination relative to the horizontal.
  4. 7. bisector the ray, line, or segment which divides a given angle into two equal parts.
  5. 9. a point where three angle bisectors from three vertices of the triangle meet.
  6. 10. angles which are formed at corresponding corners when two parallel lines are intersected
  7. 11. a line segment joining a vertex to the midpoint of the opposite side
  8. 15. two lines in the same plane that are at equal distance from each other
  9. 17. the centre point of the object.
  10. 18. a triangle having two sides of equal length
  11. 21. If any two sides and the angle included between the sides of one triangle are equivalent to the corresponding two sides and the angle between the sides of the second triangle
  12. 22. lines a pair of lines that do not intersect and are not parallel to each other.