Which one of the following may be the central angle of a minor arc

In figure, PA and PB are two tangents to a circle with center O, from an external point P such that PA =  5 cm and < APB = 60^o. Then, the length of chord AB is

The measure of ∠ P in degrees of a cyclic quadrilateral PQRS if ∠R = 80^o  is

PQRS is a cyclic quadrilateral ∠P;∠R = 2:7.Then  ∠R =

In figure PA and PB are tangents drawn from a point P to the circle with centre O.If < APB = 60^o, then the value of < AOB is

Two circles of radii 4 cm and 6 cm touch each other .then distance between their centres when they internally is

The length of a tangent drawn from a point 13 cm away from the centre of a circle of radius 5 cm is

If two concentric circle have radii 5 cm and 3 cm then, the length of chord of the larger circle which touches the other circle is:

In two concentric circles, a chord of the larger circle touches the smaller circle. If the length of this chord is 8 cm and the diameter of the smaller circle is 6 cm then, the diameter of the larger circle is

The central angle of an arc is x^o what is the central angle of its complementary arc?