Geometry puzzle #1

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Across
  1. 1. Tilted at an angle; neither vertical nor horizontal.
  2. 6. A polygon with six sides.
  3. 8. part of a line between two points
  4. 9. A mathematical sentence built from expressions using one or more equal signs (=).
  5. 10. line segments that intersect at a 90
  6. 12. An expression used to calculate a desired result, such as a formula to find volume or a formula to count combinations. Formulas can also be equations involving numbers and/or variables, such as Euler's formula.
  7. 13. A triangle with two equal length sides (and two equal internal angles)
  8. 17. The point halfway between two given points.
  9. 19. connects two points
  10. 20. The size of an angle. Angles are measured in degrees or radians.
  11. 22. Distance around a circle (the perimeter)
  12. 23. A quantity that can change or that may take on different values. Variable also refers to a letter or symbol representing such a quantity.
  13. 24. A line segment (or length) joining two points on a circles circumference and passes through the circle's center (twice the length of the radius)
Down
  1. 2. A triangle with all three sides of equal length (each internal angles = 60°)
  2. 3. an angle that measures 90
  3. 4. (line segment) from center of a circle to any point on that circle's circumference.
  4. 5. line segment that never intersects
  5. 7. a location or place
  6. 10. an equation relating the lengths of the sides of a right triangle.
  7. 11. A line segment joining two points on a curve.
  8. 14. a triangle with 3 sides of different lengths
  9. 15. Half a circle.
  10. 16. a angle that measures less then 90
  11. 18. a angle that measures more then 90
  12. 21. Part of a curve
  13. 23. point at which two line segments intersect