Geometry crossword puzzle

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Across
  1. 3. Same shape and size.
  2. 4. Negates both the hypothesis and the conclusion.
  3. 5. A figure made up of line segments connected to each other.
  4. 8. Two lines intercepting at a right angle -> 90 degrees.
  5. 12. The total distance around its outer edge.
  6. 13. Statement assumed to be true based on basic geometric principles.
Down
  1. 1. The “if” part of a conditional statement.
  2. 2. Three dimensional space occupied by a solid object.
  3. 3. The part of a conditional statement after then.
  4. 6. A statement that can be proved to be true based on known and proved facts.
  5. 7. Highest point.
  6. 9. A point on a line segment that divides
  7. 10. Gives the opposite of the truth value.
  8. 11. Two straight lines meeting at an endpoint.
  9. 12. A logical argument that demonstrates the truth of a statement using definitions, postulates, properties and theorems.