Impossible Math Crossword

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Across
  1. 3. A line that intersects two or more other lines creating corresponding and alternate angles
  2. 5. An angle formed by two perpendicular lines measuring ninety degrees
  3. 7. The ratio of vertical change to horizontal change between two points on a line
  4. 8. A triangle whose three sides are all of different lengths and angles
  5. 9. A regular hexahedron with six congruent square faces and equal edges
  6. 12. A natural number greater than one with no divisors other than one and itself
  7. 13. A simple polygon composed of exactly ten straight sides
  8. 15. A solid with two congruent parallel circular bases joined by a curved surface
Down
  1. 1. A line touching a circle at exactly one point and perpendicular to the radius there
  2. 2. The coordinate point where the x axis and y axis intersect
  3. 4. The non terminating non repeating constant relating a circle circumference to its diameter
  4. 6. A four sided polygon that has only one pair of parallel sides
  5. 10. An algebraic symbol that may represent different numerical values in different problems
  6. 11. The most frequently occurring value in a statistical data set
  7. 14. The arithmetic average found by dividing the sum of values by their count