Four parallel lines intersect another set of five parallel lines. Find the number of distinct parallelograms formed.

There are $12$ distinct points $A, B, C, ....., L$ in order, on a circle. Lines are drawn passing through each pair of points. How many lines are there in total.

There are $12$ distinct points $A, B, C, .....,L$ in order, on a circle. Lines are drawn passing through each pair of points. How many lines pass through $D$.

There are $12$ distinct points $A, B, C, ....., L$ in order, on a circle. Lines are drawn passing through each pair of points. How many triangles are determined by lines.

There are $12$ distinct points $A, B, C, ....., L$ in order, on a circle. Lines are drawn passing through each pair of points. How many triangles have on vertex $C$.