Analytic Geometry

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Across
  1. 5. A 4-sided polygon whose opposite sides are parallel and equal in length
  2. 9. A triangle with two sides of equal length and two equal angles
  3. 10. Part of a line bounded by two points
  4. 11. A triangle with three sides of equal length
  5. 12. A triangle with a 90-degree angle
  6. 13. A rectangle with all equal sides
Down
  1. 1. A parallelogram with interior right and angles pairs of equal length sides
  2. 2. A quadrilateral with parallel opposite sides
  3. 3. A point that divides a line segment exactly in half
  4. 4. The ratio of a line's rise to run, or steepness
  5. 6. A parallelogram with four equal length sides
  6. 7. A triangle with no equal side lengths and no equal angles
  7. 8. The square root of the sum of the squares of a line segment's rise and run