distance between two parallel tangents of a circle of radius 7 cm

The distance between two parallel tangents of acircle of radius 4 cm is

A tangent is drawn from a point at a distance of 17 cm of circle C(0, r) of radius 8 cm. The length of its tangent is

he length of a tangent drawn from a point at a distance of 10 cm of circle is 8 cm. The radius of the circle is

14cm

8cm

15cm

6cm