In figure, three circles centres A, B, C respectively touch each other externally. If A B = 5 cm, B C = 7 cm and CA =  6 cm then, the radius of the circle with centre A is

PA and PB are two tangents drawn to a circle from a point P outside the circle. If PA = 5 cm and ∠APB = 60^o, then the length of AB 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

From a point P, the length of the tangent to a circle is 15 cm and distance of P from the centre of the circle is 17 cm. Then what is the radius of the circle?

State " Equal; Tangent = Length" theorem

One angle of a cyclic quadrilateral is 36^o .Then its opposite angle is

In ΔPQR ,ST || QR and ^PS/_SQ = ³/₅  If PR = 6 cm
then PT =

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

Two circles touch externally at a point P from a point T on a common tangent PT , tangent segment TA and TB are drawn to the two circles .then TA =

From a point Q, the length of the tangent to a circle is 24 cm and the distance of Q from the centre is 25 cm. Then, the radius of the circle is