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13 cards from this deck
x2+y2=r2x^2 + y^2 = r^2x2+y2=r2
(xβa)2+(yβb)2=r2(x-a)^2 + (y-b)^2 = r^2(xβa)2+(yβb)2=r2
Center location and radius
x2+y2β2axβ2by+c=0x^2 + y^2 - 2ax - 2by + c = 0x2+y2β2axβ2by+c=0
Both equal to 1
No xyxyxy term present
Completing the square
90Β°
90Β° (perpendicular)
Bisects the chord (passes through midpoint)
Equal length
- rac{1}{m} (negative reciprocal)
(x2βx1)2+(y2βy1)2\sqrt{(x_2-x_1)^2 + (y_2-y_1)^2}(x2ββx1β)2+(y2ββy1β)2β
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