anonymous
  • anonymous
Which of the following is the equation of a circle whose center is at the origin and whose radius is 5 ? x(squared) + y(squared) =√5 x(squared) + y(squared) = 5 x(squared) + y(squared) = 10 x(squared) + y(squared) = 25
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
@peachpi I don't understand how to do this one!
welshfella
  • welshfella
the equation whose centre is at the origin and whose radius is r is x^2 + y^2 = r^2
welshfella
  • welshfella
now substitute for r = sqrt5 and you have it

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anonymous
  • anonymous
I got 5
welshfella
  • welshfella
you got 5 for what - i think you are on the right track
welshfella
  • welshfella
you need the correct value for r^2
anonymous
  • anonymous
so then would It be √5?
welshfella
  • welshfella
√5? is given in the question. its the radius ( r ) of the circle.
welshfella
  • welshfella
so it √5 is r what is r^2?
welshfella
  • welshfella
* if
welshfella
  • welshfella
r^2 = √5 * √5 = ?
anonymous
  • anonymous
what does ^ mean?
anonymous
  • anonymous
anonymous
  • anonymous
10?
welshfella
  • welshfella
^ means 'to the power' or exponential r^2 = r * r
welshfella
  • welshfella
the square root of some number times the square root of the number = the number ( by definition) so sqrt 3 * sqrt 3 = 3

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