Calculate the length of tangent from a point 15 cm. away from the circle of a circle of radius 9 cm.

A tangent PQ at a point P of a circle of radius 5 cm meets a line through the centre O at a point Q so that P OQ = 12 cm. Find length of PQ.

Draw a circle and two lines parallel to a given line such that one is a tangent and the other, a secant to the circle.

Prove that the tangents to a circle at the end points of a diameter are parallel.

Choose the correct answer and give justification for each.

The angle between a tangent to a circle and the radius drawn at the point of contact is

A. 60^o

B. 30^o

C. 45^o

D. 90^o