31.
ա)a(0;5)
(x-0)^2+(y-5)^2=9
բ)A(-1;2) r=2
(x+1)+(y-2)^2=4
գ)
A(-3, -7). r=1/2
(x+3)^2+(y+7)^2=1/4
դ)A=(4;-3) r=10
(x-4)^2+(y+3)^2=100
32. (-1-0)^2+(3-0)^2=r^2
1+9=r^2
10=r^2
r=V10
33.
M(-3;5)
N(7, -3)
x0=-3+7/2=2
y0=5-3/2=1
(7-2)^2+(-3-1)^2=39
r^2=39
r=V39
B)M(2;-1)
N(4;3)
x0=2+4/2=3
y=-1-3/2=-2
(4-2)^2+(3+2)^2=39
r^2=39
r=V39
34.
A(1;3)
(5;0)
(1-5)^2+(3-0)^2=25
(1-x)^2+9=25
(1-x)^2=16
1-x=4
x=3