Mathematics

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Across
  1. 3. when the sum of two angles is equal to 90 degree
  2. 4. half of diameter
  3. 7. the average of the given numbers
  4. 8. part of a line with one end point
  5. 9. the opposite sides are parallel and equal to each other and all four angles are right angles
  6. 11. When none of the sides of a triangle are equal
  7. 13. perimeter of a circle is called
  8. 14. number staring from 1 is called
  9. 15. a six-sided polygon
Down
  1. 1. who's volume is l*b*h
  2. 2. a line which intersects two or more lines at distinct points
  3. 5. lines that never meet
  4. 6. a triangle in which all three sides have the same length
  5. 9. a number that can be represented as the quotient p/q of two integers such that q ≠ 0
  6. 10. the point of intersection of all the three medians of triangle
  7. 12. angle that is less than 90⁰