Geometry Puzzle

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Across
  1. 4. angles each of the pairs of opposite angles made by two intersecting lines.
  2. 8. a part of a whole
  3. 9. a measure of the total area that the surface of the object occupies
  4. 12. the amount of space that a substance or object occupies
  5. 13. a straight line passing from side to side through the center of a body or figure, especially a circle or sphere.
  6. 15. how much space a shape takes up
  7. 16. angles when the sum of two angles is 90°
Down
  1. 1. a geometrical figure formed when two rays meet at a common point called vertex.
  2. 2. a line around the outside of a figure
  3. 3. another word for figure
  4. 5. a shape made up of other shapes
  5. 6. a straight path that goes on forever in both directions
  6. 7. a set form of words used in performing a ceremony or ritual
  7. 10. 2πr
  8. 11. angles those angles that sum up to 180 degrees
  9. 14. the m in y = mx+b