Question

Help Me on this!!


`\: \: \:`
​

Answer 1

`\qquad\qquad\huge\underline{{\sf Answer}}♨`

Here's the solution~

Standard equation of a circle is represented as :

`\qquad \sf  \dashrightarrow \:(x - h) {}^(2) + (y - k) {}^(2) = r {}^(2)`

where,

• h = x - coordinate of center

• k = y - coordinate of center

• radius = diameter/2 =
  `4√(3)`

Now, let's plug in the values to find the required equation of circle ~

`\qquad \sf  \dashrightarrow \:(x - 8) {}^(2) + (y - ( - 10)) {}^(2) = (4√(3) ) {}^(2)`

`\qquad \sf  \dashrightarrow \:(x - 8) {}^(2) + (y + 10) {}^(2) = 16 * 3`

`\qquad \sf  \dashrightarrow \:(x - 8) {}^(2) + (y + 10) {}^(2) = 48`

Answer 2

The equation of given circle with centre C ( 8 , - 10 ) and diameter ( 8√3 ) is x² + y² - 16x + 20y + 116 = 0

`\quad\rule{300pt}{1pt}\quad`

Solution:

The standard equation of Circle is given by :

`{\pmb{\sf {\longrightarrow r^2 = (x-h)^2 +( y-k)^2}} }`

This is the standard form of the equation. Thus if we know the coordinates of center of the circle and it's radius, we can easily find its equation

Here, in this question we are given that the centre C is ( 8 , -10 ) and diameter 8√3.

`\longrightarrow`h = 8

`\longrightarrow` k = - 10

`\longrightarrow` r =
`\sf{(diameter)/(2)}`

`\longrightarrow`‎ r =
`\sf 4√(3)`

`\qquad\qquad\rule{250pt}{1pt}\qquad`

On putting the values in the formula :

`\sf{:\implies \qquad r^2 = (x-h)^2+ ( y-k)^2 }`

`\sf{:\implies \qquad (4√(3))^2 = ( x-8)^2 +(y-(-10))^2 }`

`\sf{:\implies \qquad (4)^2.(√(3))^2=(x-8)^2+(y+10)^2}`

`\sf{:\implies \qquad 16* 3 =( x^2 + 8^2 -2* x * 8 ) + ( y^2 + 10^2 + 2* y * 10 )}`

`\sf{:\implies \qquad 48 = x^2 + y^2 - 16x + y^2 + 100 + 20y }`

`\sf{:\implies \qquad 48 = x^2 + y^2 -16 x + 20y + 100 + 64 }`

`\sf{:\implies \qquad 48 = x^2 +y^2 -16x +20y +164}`

`\sf{:\implies \qquad x^2 + y^2 -16x +20y +164 - 48 = 0}`

`\sf{:\implies \qquad{\boxed{ \sf x^2 + y^2 -16x + 20y +116 = 0 }}}`

‎ㅤ‎ㅤ‎ㅤ‎ㅤ~Hence, the required equation of Circle is x² + y² - 10x + 20y + 116 = 0