Geometry terms

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Across
  1. 2. a line segment from the vertex to the opposite sides midpoint
  2. 5. the distance from the center to any point on the circle
  3. 8. the distance from the vertex of a triangle to its base
  4. 10. a side of a triangle
  5. 11. a logical argument that uses known facts to explain why a statement is true
  6. 13. a closed shape made by 3 straight line segments
  7. 14. a point on a line segment that divides it into two equal parts
  8. 15. a triangle that has 3 sides of different length
  9. 17. a line segment that passes through a circle but doesn't pass through the center
  10. 18. the measure of space between two intersecting lines
Down
  1. 1. having the same size and shape
  2. 3. a transformation that changes the size of a geometric figure without changing its shape
  3. 4. two lines that will never intersect
  4. 6. a new figure that is the result of a transformation
  5. 7. when thewy add up to 180 degrees
  6. 9. A closed figure such that set of points that is equidistant from a given point
  7. 12. a line segment that begins at one point and goes on indefinitely in one direction
  8. 15. a rectangle with 4 congruent sides
  9. 16. undefined