math Definitions

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Across
  1. 2. the center point of the object
  2. 5. a statement that is true without proof
  3. 6. an angle less than 90 degrees
  4. 10. a line segment that joins a vertex to the midpoint of the opposite side
  5. 12. a 90-degree angle
  6. 15. the distance that surrounds a circle
  7. 16. having the exact same shape and size, identical
  8. 17. a figure with 4 equal sides and 4 right angles
  9. 18. a quadrilateral with a pair of parallel sides
  10. 19. the amount of space within the shape
Down
  1. 1. the middle point of a line segment
  2. 3. a half-infinite line
  3. 4. a polygon with 6 sides
  4. 6. a line or line segment that divides the angle into two equal parts
  5. 7. formed by two rays or lines that shares a common endpoint
  6. 8. angles that are beside each other
  7. 9. the total distance around the shape
  8. 11. a statement that can be proven
  9. 13. the opposite of an operation
  10. 14. a straight figure extending infinitely