A tangent PT at a point T of a circle of a radius 8cm meets a line through the centre O at a point P so that OP = 17 cm. Then, the length of PT 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 diameter of the smaller circle is 6cm, then find the diameter of the larger circle.

Which of the following is a line that intersects the circle in exactly one point.

The length of the diagonal of a rectangle is 10 cm. The area of its circumscribed circle is 

Quadrilateral ABCD is drawn such that all its sides touch the circle. If AB = 6 cm, BC = 7 cm and CD = 4 cm, find AD.

Two circles touch externally at a point P. From a point T on a common tangent PT, tangent segments 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

If two concentric circles have radii 5cm and 3cm then the length of the chord of the larger circle which touches the

other circle is

When a point P lies on a circle, then number of tangents to the circle through P is

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