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NDA2012MathematicsTrigonometric Ratios & IdentitiesActual

The angle subtended at the centre of a circle of radius 3 cm by an arc of length 1 cm is :

Options

  1. A30^
  2. B60^
  3. C60^
  4. DNone of the above

Correct answer

B. 60^

Step-by-step solution

aligned & l=1 ~cm & r=3 ~cm & = l r = 1 3 radian aligned aligned & radian =180^ & 1 3 radian = 180 1 3 = 60^ . aligned

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