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In a circle of radius 7, a chord subtends 90 degrees at the centre. Its length is
A7 root 3 units
B7 root 2 units
C7 root 5 units
D7 root 6 units
Answer & Solution
Correct answer: B. 7 root 2 units
The chord is the hypotenuse of a right triangle with legs 7 and 7, so it is 7 root 2.
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