Geometry

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Across
  1. 5. If two sides in a triangle are congruent, then the opposite angles to these sides are congruent
  2. 6. the amount of space that a substance or object occupies
  3. 9. A line, line segment, ray, or point that cuts a line segment exactly in half
  4. 11. a line that splits an angle into two equal angles
  5. 12. a proposition that is consistent with known data, but has been neither verified nor shown to be false
  6. 14. in the same plane
  7. 15. lying in the same straight line
Down
  1. 1. Identical in form
  2. 2. the continuous line forming the boundary of a closed geometric figure
  3. 3. Space between two intersecting lines or surfaces at or close to the point where they meet
  4. 4. each angular point of a polygon, polyhedron, or other figure
  5. 7. an angle of 90° to a given line, plane, or surface
  6. 8. a plane figure with at least three straight sides and angles, and typically five or more
  7. 10. a mathematical statement which appears to be true, but has not been formally proven
  8. 13. A point in the center joining two points