2009 · Q38
In the figure given above, PT is a tangent to a circle of radius 6 cm. If P is at a distance of 10 cm from the centre O and PB = 5 cm, then what is the length of the chord BC?
Elementary MathematicsGeometry
- A7.8 cm
- B8.0 cm
- C8.4 cm
- D9.0 cm
Explanation
PT² = PB·PC gives chord BC = 7.8 cm.