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12 cards from this deck
(x−h)2+(y−k)2=r2(x - h)^2 + (y - k)^2 = r^2(x−h)2+(y−k)2=r2
Centre of the circle
Radius of the circle
Equidistant from centre
r2r^2r2 (radius squared)
Distance formula: centre to point
(x−2)2+(y+3)2(x - 2)^2 + (y + 3)^2(x−2)2+(y+3)2 (opposite signs)
(x−2)2+(y+3)2=25(x - 2)^2 + (y + 3)^2 = 25(x−2)2+(y+3)2=25
(−3,4)(-3, 4)(−3,4) (opposite signs)
sqrt8=2sqrt2sqrt{8} = 2sqrt{2}sqrt8=2sqrt2
sqrt(x2−x1)2+(y2−y1)2sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2}sqrt(x2−x1)2+(y2−y1)2
Sign errors with centre coordinates
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