这个题的计算过程麻烦写一下,
2个回答
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(2-a)^2+(2-b)^2 =r^2 (1)
(5-a)^2+(3-b)^2 =r^2 (2)
(3-a)^2+(-1-b)^2 =r^2 (3)
(1)-(2)
(6a -21)+( 2b-5)=0
3a+b = 13 (4)
(2)-(3)
(4a-16)+(8b-8)=0
a+2b = 6 (5)
2(4)-(5)
5a=20
a=4
from (5)
4+2b=6
b=1
from (1)
(2-4)^2+(2-1)^2 =r^2
4+1=r^2
r=√5
(a,b,r) = (4,1,√5)
(5-a)^2+(3-b)^2 =r^2 (2)
(3-a)^2+(-1-b)^2 =r^2 (3)
(1)-(2)
(6a -21)+( 2b-5)=0
3a+b = 13 (4)
(2)-(3)
(4a-16)+(8b-8)=0
a+2b = 6 (5)
2(4)-(5)
5a=20
a=4
from (5)
4+2b=6
b=1
from (1)
(2-4)^2+(2-1)^2 =r^2
4+1=r^2
r=√5
(a,b,r) = (4,1,√5)
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