PQ is a diameter of a circle with centre O. RS is a chord parallel to PQ subtends an angle of $40^{0}$ at the centre of the circle. If PR and QS are produced tomeet at T, then what will be the measure (in degrees) of $\angle PTQ$?

PQ is a diameter of a circle with centre O. RS is a chord parallel to PQ subtends an angle of $40^{0}$ at the centre of the circle. If PR and QS are produced tomeet at T, then what will be the measure (in degrees) of $\angle PTQ$?
1). 55
2). 60
3). 70
4). 90

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