Answer:
The equation the circle is given by

Step-by-step explanation:
The general form of the circle is

Given points are (5,0) , (0,4) and (2,4)
Let the points (5,0) , (0,4) and (2,4) be (x_1,y_1) , (x_2,y_2) and (x_3,y_3) respectively
The equation of the circle passes through given points (5,0) , (0,4) and (2,4)
Substituting the point (5,0) in (1)



Substituting the point (0,4) in



Substituting the point (2,4) in



By solving the equations (2) ,(3) and(4) we get the values of D,E and F as below
,
and 
substituting the values of D,E and F in (1) we get

Now multiplying the above equation into 4 we get