Mathematics

4. when the sum of two angles is equal to 90 degree
10. who's volume is l*b*h
13. the opposite sides are parallel and equal to each other and all four angles are right angles
15. a triangle in which all three sides have the same length

1. a number that can be represented as the quotient p/q of two integers such that q ≠ 0
2. the point of intersection of all the three medians of triangle
3. a six-sided polygon
4. perimeter of a circle is called
5. the average of the given numbers
6. part of a line with one end point
7. When none of the sides of a triangle are equal
8. angle that is less than 90⁰
9. a line which intersects two or more lines at distinct points
11. lines that never meet
12. half of diameter
14. number staring from 1 is called