Mathematics Crossword Puzzle

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Across
  1. 2. A Indian mathematician who wrote the first work with full and systematic use of the decimal number system.
  2. 5. Two lines that form right angles where they intersect.
  3. 6. A Greek mathematician, often referred to as the "founder of geometry" or the "father of geometry".
  4. 7. Points are From Equal Distant to each other.
  5. 11. Where lines cross over at a common point.
  6. 12. There are ________ many rational numbers between any two rational numbers.
  7. 17. The combination of rational and irrational number is called _______ numbers.
  8. 18. An _________ is a mathematical statement that two expressions are equal.
  9. 19. A Number or symbol multiplied with a variable or an unknown quantity in an algebraic term.
  10. 20. A straight path that has a beginning but not ending.
Down
  1. 1. An angle that measures more than 180 degrees but less than 360 degrees.
  2. 3. When a figure is folded in half and the two halves match perfectly.
  3. 4. _______terms are terms that have the same variables and powers.
  4. 8. A unit used to measure an angle.
  5. 9. Distance of a point from y axis.
  6. 10. _______is the ratio of the circumference of any circle to the diameter of that circle.
  7. 13. All natural numbers together with zero and negatives of all natural numbers form the set of _______.
  8. 14. the product of (2+root3)(4+root5)is a __________ number.
  9. 15. All natural numbers are ________ numbers.
  10. 16. A letter or symbol used as a placeholder for an unknown value.