A. R = 3

B. R = 9

C. R = 1

D. R = 5

A.  $\left(P\right):x+2y+3z+6=0$

B.  $\left(P\right):x+2y+z-2=0$

C.  $\left(P\right):x-2y+z-6=0$

D.  $\left(P\right):3x+2y+2z-4=0$

A.  ${\left(x+1\right)}^2+{\left(y+1\right)}^2+{\left(z+1\right)}^2=6$

B.  ${\left(x+1\right)}^2+{\left(y-1\right)}^2+{\left(z+1\right)}^2=6$

C.  ${\left(x-1\right)}^2+{\left(y-1\right)}^2+{\left(z+1\right)}^2=6$

D.  ${\left(x+1\right)}^2+{\left(y+1\right)}^2+{\left(z-1\right)}^2=6$

A.  ${\left(x-2\right)}^2+{\left(y-1\right)}^2+{\left(z-1\right)}^2=1$

B.  ${\left(x+2\right)}^2+{\left(y+1\right)}^2+{\left(z-1\right)}^2=1$

C.  ${\left(x-2\right)}^2+{\left(y-1\right)}^2+{\left(z+1\right)}^2=1$

D.  ${\left(x-2\right)}^2+{\left(y+1\right)}^2+{\left(z-1\right)}^2=1$

A.  $x^2+(y-3{)}^2+(z-1{)}^2=20$

B.  $x^2+(y+1{)}^2+(z+2{)}^2=5$

C.  $(x-2{)}^2+(y-1{)}^2+(z+3{)}^2=20$

D.  $(x-1{)}^2+(y-2{)}^2+(z+1{)}^2=14$

$\mathit{A}. \left(S\right):(x+1{)}^2+(y-2{)}^2+(z-1{)}^2=3$

$\mathit{B}. \left(S\right):(x-1{)}^2+(y-2{)}^2+(z+1{)}^2=9$

$\mathit{C}. \left(S\right):(x-1{)}^2+(y+2{)}^2+(z+1{)}^2=3$

$\mathit{D}. \left(S\right):(x+1{)}^2+(y-2{)}^2+(z-1{)}^2=9$

A. R = 3

B. R = 9

C. R = 1

D. R = 5

A.  $H\left(\frac{7}{3};\frac{7}{3};-\frac{2}{3}\right)$

B. $H\left(\frac{1}{3};\frac{1}{3};-\frac{2}{3}\right)$

C.  $H\left(\frac{7}{3};-\frac{7}{3};\frac{2}{3}\right)$

D.  $H\left(\frac{7}{3};\frac{7}{3};\frac{2}{3}\right)$