Question : In the given figure, point O is the centre of a circle of radius 13 cm and AB is a chord perpendicular to OD. If CD = 8 cm, what is the length (in cm) of AB?
Option 1: 6 cm
Option 2: 12 cm
Option 3: 24 cm
Option 4: 28 cm
Correct Answer: 24 cm
Solution : Given, Radius = 13 cm CD = 8 cm ⇒ OC = 13 – 8 = 5 cm [As OD is the radius] In $\triangle AOC$, Using Pythagoras theorem, we get, $AO^2=OC^2+AC^2$ ⇒ $13^2=5^2+AC^2$ ⇒ $AC^2=169-25$ ⇒ $AC=\sqrt{144}$ $\therefore AC = 12$ cm Now, $AB = 2\times AC= 2\times 12 = 24$ cm Hence, the correct answer is 24 cm.
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