The length of diameter can be calculated by using formula;

d = [(x

(x

(x

d = [ (-4-2)2 + ( -5- 3)2 ]1/2

d= [ 100]1/2

d= 10

Radius = diameter / 2 = 5

The mid point of the circle can be calculated as;

M.P = [(x

M.P = [(2 - 4 )/ 2, (3-5)/2]

M.P = (-1, -1)

The standard equation of circle is;

(x-*-1)2 + (y-*-1)2 = 5

(x + 1)2 + (y + 1)2 = 25

d = [(x

_{2}-x_{1})2 + (y_{2}-y_{1})2]1/2(x

_{1}, y_{1}) = (2, 3 )(x

_{2}, y_{2}) = (-4, -5)d = [ (-4-2)2 + ( -5- 3)2 ]1/2

d= [ 100]1/2

d= 10

Radius = diameter / 2 = 5

The mid point of the circle can be calculated as;

M.P = [(x

_{1}+ x_{2})/2, (y_{2}+y_{1})/2]M.P = [(2 - 4 )/ 2, (3-5)/2]

M.P = (-1, -1)

The standard equation of circle is;

(x-*-1)2 + (y-*-1)2 = 5

^{2}(x + 1)2 + (y + 1)2 = 25