Crossword Puzzle

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Across
  1. 1. A triangle with exactly two sides of equal length.
  2. 3. Two lines that intersect at a right angle.
  3. 5. A line segment that connects two points on a circle.
  4. 7. Two lines that never intersect.
  5. 8. A straight path that extends infinitely in one direction.
  6. 10. A straight path with no endpoints.
Down
  1. 2. A triangle with all sides of equal length.
  2. 4. The distance from the center of a circle to any point on its circumference.
  3. 6. A line segment that passes through the center of a circle.
  4. 9. The space between two intersecting lines or surfaces, measured in degrees.