ratpizza
12.08.2020 •
Mathematics
Write the General Form of the equation of the circle centered at (1, 2) with radius 3. PL Help
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Ответ:
X^2 +Y^2 - 2X-4Y= 0
Step-by-step explanation:
From the circle eqn.
(x-a) ^2 +(y-b) ^2 =r^2
a=1, b= 2. r= 3
(x-1)^2 +(y-2)^2 =3^2
(x-1)(x-1)+(y-2)(y-2)=3^2
X^2 - 2x+1+y^2 -4y+4=9
X^2 +Y^2 - 2x-4y+5=9
X^2 +Y^2 - 2x-4y-4=0
Ответ: