Question 11
Circle TheoremsA circle has centre O and radius 5cm. From an external point P, a tangent PT is drawn to touch the circle at T. If OP = 13cm, find the length PT
- A.6cm
- B.14cm
- C.12cm
- D.11cm
Show the answer and explanation
Answer: C (12cm)
Explanation
The radius OT is perpendicular to the tangent, so PT² = 13² − 5² = 144 and PT = 12 cm.