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COMEDK2019MathematicsTrigonometric Ratios & Identities

-The perimeter of a certain sector of a circle is equal to the length of the arc of the semicircle. Then, the angle at the centre of the sector in radians is

Options

  1. A-2
  2. B+2
  3. C3
  4. D2 3

Correct answer

A. -2

Step-by-step solution

It is given that, Perimeter of sector = Length of arc of the semi-circles array ll & 2 r+l= r & 2 r+r = r [l l=r ] & r(2+ )= r & = -2 array

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