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13 cards from this deck
A circle positioned at the origin
(0,0), where x-axis and y-axis meet
Distance from centre to any point on circle
Set of points same distance (radius) from centre
x2+y2=r2x^2 + y^2 = r^2x2+y2=r2
x2+y2=9x^2 + y^2 = 9x2+y2=9
Substitute rrr into x2+y2=r2x^2 + y^2 = r^2x2+y2=r2
Use distance formula to find rrr first
r=sqrtx2+y2r = sqrt{x^2 + y^2}r=sqrtx2+y2
Take square root of the constant
Rearrange first before identifying radius
r=sqrt8=2sqrt2r = sqrt{8} = 2sqrt{2}r=sqrt8=2sqrt2
Divide by 9 to get x^2 + y^2 = rac{16}{9}
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