If radii of two concentric circles are 4 cm and 5 cm, then the length of each chord of one circle which is tangent to the other circle is ______. If radii of two concentric circles are 4 cm and 5 cm, then the length of each chord of one circle which is tangent to the other circle is 6 cm. Explanation: Given, OA = 4 cm, OB = 5 cm And, OA ⊥ BC Therefore, OB2 = OA2 + AB2 ⇒ 52 = 42 + AB2 ⇒ AB = `sqrt(25 - 16)` = 3 cm ⇒ BC = 2AB = 2 × 3 cm = 6 cm Concept: Tangent to a Circle Is there an error in this question or solution? |