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AP EAMCET2005MathematicsCircle

Which of the following equations gives a circle?

Options

  1. Ar=2
  2. Br^2 2 =1
  3. Cr(4 +5 )=3
  4. D5=r(1+ 2 )

Correct answer

A. r=2

Step-by-step solution

Now, taking option (a) i.e. r=2 Let x=r , y=r r^2=2 r x^2+y^2=2 y [ x^2+y^2=r^2 ] This equation represents a circle.

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