Multiple choice

The equation of a circle in parametric form is given by $x=a\, \cos\, \theta \, ,y\, =a\, \sin\, \theta $. If $a = 2$, the equation of the chord AB of the above circle, whose mid-point is at a perpendicular distance of $3$ from the point $P(h, k)$ on the circle is:

  1. $x + y + h + k = 4$
  2. $hx - ky = 4$
  3. $hx + ky = 4$
  4. $hx + ky = - 2$
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D Correct answer