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O is the centre of a circle and AB is the tangent to it touching at B. If OB = 3 cm. and OA = 5 cm, then the measure of AB in cm is    (SSC CGL 1st Sit. 2016)
  • a)
    √34
  • b)
    2
  • c)
    8
  • d)
    4
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
O is the centre of a circle and AB is the tangent to it touching at B....

OA2 = OB2 + BA2
AB2 = 52 – 32
= 25 – 9 = 16
∴ AB = 4
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Most Upvoted Answer
O is the centre of a circle and AB is the tangent to it touching at B....

OA2 = OB2 + BA2
AB2 = 52 – 32
= 25 – 9 = 16
∴ AB = 4
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