The sides of a square are x= 6, x =9, y = 3 and y = 6.
Find the equation of a circle drawn on di diagonal of the square as its diameter.
Let the sies AB, BC, CD and DA of the square ABCD be represented by the equations
y = 3, x = 6, y = 6 and x = 9 respectively.
Then, coordinates are
A(6, 3), B(9, 3), C(9, 6) and D(6, 6)
The equation of the circle with diagonal AC
(x−6)(x−9)+(4−3)(4−6)=0⇒x2−6x−9x+54+y2−3y−6y+18=0⇒x2+y2−15x−9y+72=0
The equation of the circle with diagonal BD as diameter is
(x−9)(x−6)+(y−3)(y−6)=0⇒x2−9x−6x+54+−3y−6y+18=0⇒x2+y2−15x−9y+72=0x2+y2−15x−9y+72=0