Question

TOLONG DIBANTU. CUMA 1 NOMOR. NO. 5. PAKE CARANYA. MAKASIH SEBELUMNYA

Answer 1

Mell (-4,7) : (-4-a)²+(7-b)²= r²...pers 1
mell (-1,7) : (-1-a)²+(7-b)²= r².. pers 2
mell (0,5). : (0-a)²+(5-b)²=r²..pers 3

pers 1 : (-4-a)²+(7-b)²=r²
pers 2 : (-1-a)²+(7-b)²=r²
_________________ -
(-4-a)² - (-1-a)² = 0
16+8a+a²-(1+2a+a²)=0
6a + 15 = 0
a = - 15/6
= - 5/2

pers 2 : (-1-a)²+(7-b)²= r²
pers 3 : (0-a)²+(5-b)²= r²
_________________ -
1+2a+a²-a²+49-14b+b²-25+10b-b²=0
2a-4b+25 = 0
4b= 2a+25
= 2(-5/2)+25
= -5+ 25
= 20

b= 5

shgg a= -5/2. b= 5

pers 3: (0+5/2)²+(5-5)²=r²
25/4 = r²

sehingga r²= 25/4

pers lingk : (x+5/2)²+(y-5)²= 25/4
x²+5x+25/4+y²-10y+25-25/4=0
x²+y²+5x-10y+25 = 0