1.Podaj środek i promień okręgu o równaniu :
a).x2 +y2 -4x = 21
b).x2+6x+y2-10y= -30
c).x2+y2-2x+6y+15 = 0
a) S=(4,0)
r>0
r^2=a^2+b^2-c=0
r^2=4^2+0^2-0=0
r^2=16
r=4
b) S=(-6,10)
r^2=(-6)^2+10^2-0=0
r^2=36+100=0
r^2=136
r=
c) S=(2,-6)
r^2=2^2+(-6)^2-15=0
r^2=4+36-15=0
r^2=25
r=5
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a) S=(4,0)
r>0
r^2=a^2+b^2-c=0
r^2=4^2+0^2-0=0
r^2=16
r=4
b) S=(-6,10)
r>0
r^2=a^2+b^2-c=0
r^2=(-6)^2+10^2-0=0
r^2=36+100=0
r^2=136
r=
c) S=(2,-6)
r>0
r^2=a^2+b^2-c=0
r^2=2^2+(-6)^2-15=0
r^2=4+36-15=0
r^2=25
r=5