Q.From an external point located 17 cm away from the center of a circle with a diameter of 16 cm, what is the length of the tangent drawn to the circle?

OB ⊥ AB and OA = 17 cm, OB = \( \frac{16}{2} \) cm = 8 cm ∴ OB² + AB² = OA² i.e., 8² + AB² = 17² i.e., AB² = 289 − 64 = 225 i.e., AB = √225 = 15 ∴ The length of the tangent drawn to the circle is 15 cm.
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