Tangent drawn from a point X, touches the circle at U. O is the centre of this circle. If XU = 15 cm and OU = 8 cm, then what is the value of OX?
Answer & explanation
Correct answer: option 4
We know that , Radius touches tangent UX at 90º
By using pythagoras theorem,
h² = b² + p²
OX² = OU² + UX²
OX² = 8² + 15²
OX² = 64 + 225
OX² = 289
OX = 17 cm