19. Conic Sections
Circles
Multiple Choice
Multiple ChoiceDetermine if the equation x3+y2+4x−8y+4=0 is a circle, and if it is, find its center and radius.
A
Is a circle, center = c(0,0), radius r=4.
B
Is a circle, center = c(0,0)c(2,−4), radius r=4.
C
Is a circle, center = c(−2,4)c(0,0), radius r=4.
D
Is not a circle.
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