Everything you know about round shapes

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Across
  1. 3. area the sum of the areas of every face of a solid figure
  2. 7. circles that share the same centre with different radii
  3. 10. the longest possible chord
  4. 11. a line segment from any point on the circumference to the centre
  5. 12. a line segment whose endpoints both lie on a circle
  6. 14. a ring shape bounded by two concentric circles
  7. 15. a circle that passes through all the vertices of the polygon
  8. 16. a line cutting through a circle
  9. 18. a solid shape that tapers from a flat base to a point
  10. 20. the locus of points equidistant from one fixed point
  11. 21. a line touching a circle at only one point
  12. 22. the distance from any point on the circle of its base to the apex via a line segment along the surface of the cone
  13. 24. the concave-convex area bounded by two circular arcs
  14. 25. the total length of all the sides or edges of a two dimensional figure
Down
  1. 1. half of a circle
  2. 2. a portion of a disk which is cut off from the rest of it by a chord
  3. 4. a portion of the circumference of a circle
  4. 5. an angle formed by two radiuses of a circle
  5. 6. the region bounded by a circle
  6. 8. the perimeter of a circle
  7. 9. the amount of space inside a solid figure
  8. 13. the tip of a cone
  9. 15. two parallel bases connected by a closed surface
  10. 17. the distance from the centre to a chord in a circle
  11. 19. all points on a circle are equidistant from it
  12. 23. the segment connecting the apex of a cone to the center of its base
  13. 24. the convex-convex area bounded by two circular arcs