$A$ polygon has $44$ diagonals. The number of its sides is

Out of $10$ points in a plane,$6$ are collinear. How many triangles can be formed by joining these points?

In a tournament with five teams,each team plays against every other team exactly once. Each game is won by one of the playing teams and the winning team scores one point,while the losing team scores zero. Which of the following is $NOT$ necessarily true?

Out of $20$ points,no three points are collinear except for $4$ points which are collinear. How many lines can be drawn by joining these points?

There are $n$ distinct points on the circumference of a circle. If the number of pentagons that can be formed using these points as vertices is equal to the number of triangles that can be formed,then what is the value of $n$?

If the number of diagonals of a regular polygon is $35$,then the number of sides of the polygon is