Step 1: Write out the formular for the equation of a circle with the radius and the centre of the circle given.
(x-a)² + (y-b)² = r²
Step 2: Write out the given data
a= 8
b=4
r= radius= 7
Step 3: Substituting the values


Hence the equation of the circle is x²+y²-16x-8y+31=0.