Geometry Shenanigans

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Across
  1. 5. A polygon with 5 sides and 5 angles
  2. 6. a angle greater than 90 degrees but less than 180
  3. 10. a round plane figure whose boundary (the circumference) consists of points equidistant from a fixed point (the center)
  4. 12. a line that goes up and down
  5. 13. a plane figure with three straight sides and three angles
  6. 15. a line that divides an angle in half
  7. 16. an angle of 90°, as in a corner of a square or at the intersection of two perpendicular straight lines
  8. 18. a straight line passing from side to side through the center of a body or figure, especially a circle or sphere
Down
  1. 1. a line that goes side to side
  2. 2. and angle less than 90 degrees
  3. 3. formed at the intersection of two distinct lines
  4. 4. The intersection point of two sides of a plane figure
  5. 7. a straight line that cuts a curve in two or more parts
  6. 8. n geometry, an equilateral triangle is a triangle in which all three sides are equal
  7. 9. a contentious extent of length
  8. 11. has a starting point and goes on forever in the opposite direction
  9. 13. touching, but not intersecting, a curve or curved surface
  10. 14. 3.14
  11. 17. a polygon with 6 sides and 6 angles that are the same
  12. 19. a straight line from the center to the circumference of a circle or sphere