Geometry Crossword Puzzle

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Across
  1. 2. a straight line from the center of a circle to the outer edge
  2. 4. a figure with five sides and five vertices, also the shape of a school cross walk sign
  3. 6. a structure used to plot points and graph shapes
  4. 9. two shapes with the same shape and size are?
  5. 10. a helpful technique for remembering the definitions of the trigonometric functions sine, cosine, and tangent
  6. 13. a 2D figure with no angles and no sides
  7. 14. amount of surface in a shape
  8. 15. a figure with three straight sides and three angles
  9. 16. the middle point
  10. 18. amount of space in a certain 3D object
Down
  1. 1. the radius doubled
  2. 3. a mathematical statement used to solve a problem
  3. 5. shape of a party hat
  4. 7. mathematics related to shapes
  5. 8. a quadrilateral with four straight sides and four right angles and does not have four equal sides
  6. 10. an lines incline or decline on a graph
  7. 11. a figure with four equal sides and four right angles, all the same lengths
  8. 12. measurement of the distance of an object's base to its top
  9. 17. ordered pair of numbers written over each other to show how many times one number can fit into another