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

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

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

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.

Number of tangents a circle have

The length of BC is

The tangent at any point of a circle is perpendicular to the _________ through the point of contact.

A circle is inscribed in a ΔABC having AB = 10 cm, BC = 12 cm, and CA = 8 cm and touching the sides at D, E, F respectively. Find AD, BE, CF.

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.

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 =