PQRS is a quadrilateral in which PQ = PS and RQ = RS. If PR and QS intersect at O, then which of the following is true?
1
PR and QS are equal and bisect each other.
2
PR and QS are equal but do not bisect each other.
3
PR and QS are perpendicular to each other and O is the mid-point of PR.
4
PR and QS are perpendicular to each other and O is the mid-point of QS.