Mental Maths

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Across
  1. 3. who is known as the father of mathematics.
  2. 5. which type of numbers include both rational and irrational numbers.
  3. 8. The line segment joining a vertex to the mid point of the opposite sides of the triangle is called.
  4. 10. The pair of lines which never intersect each other are called
Down
  1. 1. A pair or two natural numbers each of which is the sum of the proper divisors of the other are called which numbers.
  2. 2. skewness for a normal distribution is
  3. 4. the average of the numbers in a given set is called.
  4. 5. an angle measures more than 180 degrees and less than 360 degrees is called.
  5. 6. The point where the three medians of a triangle intersect is known as?
  6. 7. who is called the father of trigonometry
  7. 9. the highest power of a variable in a polynomial is called its.