Geometry puzzle #1

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