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

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.

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

CP and CQ are tangents to a circle with centre O. ARB is another tangent touching the circle at R. If CP = 11 cm, and BC = 7 cm, then the length of BR is

If P is a point outside the circle, then the number of tangents from P to the circle is

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

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

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.

Number of tangents a circle have

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