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**Hint:**This is a question of 2D geometry. To find the equation of a circle with center and radius given we need to find the locus of a point which has a fixed distance as radius from the center point. We will be using the distance formula given by \[\sqrt{{{\left( {{x}_{2}}-{{x}_{1}} \right)}^{2}}+{{\left( {{y}_{2}}-{{y}_{1}} \right)}^{2}}}\].

**Complete step by step answer:**

Here we are given the center as (2,4) and radius of the circle as 6 units. We will use the distance between points formula to find the locus of the point that is the circle.

The distance between two points in 2D , \[\left( {{x}_{1}},{{y}_{1}} \right),\left( {{x}_{2}},{{y}_{2}} \right)\] is given by the distance formula as

\[\Rightarrow \]\[\sqrt{{{\left( {{x}_{2}}-{{x}_{1}} \right)}^{2}}+{{\left( {{y}_{2}}-{{y}_{1}} \right)}^{2}}}\]

In the case of a circle this distance is fixed and called Radius (r) . So the equation can be given as

\[\Rightarrow \]\[\sqrt{{{\left( {{x}_{2}}-{{x}_{1}} \right)}^{2}}+{{\left( {{y}_{2}}-{{y}_{1}} \right)}^{2}}}=r\]

Squaring both side we get

\[\Rightarrow \]\[{{\left( {{x}_{2}}-{{x}_{1}} \right)}^{2}}+{{\left( {{y}_{2}}-{{y}_{1}} \right)}^{2}}={{r}^{2}}.......(1)\]

In the above question we are given the fixed radius r that is 6 units and center (2,4).

Now we assume a point on the circle say (x,y)

Then in equation (1) we substitute the values \[\left( {{x}_{1}},{{y}_{1}} \right)\]as (2,4) and \[\left( {{x}_{2}},{{y}_{2}} \right)\] as (x,y) and r as 6.

Now we get

\[\Rightarrow \]\[{{\left( {{x}_{{}}}-{{2}_{{}}} \right)}^{2}}+{{\left( {{y}_{{}}}-4 \right)}^{2}}={{6}^{2}}\]

Thus the required equation of circle with center (2,4) and radius 6 is given by

\[\Rightarrow \]\[{{\left( {{x}_{{}}}-{{2}_{{}}} \right)}^{2}}+{{\left( {{y}_{{}}}-4 \right)}^{2}}={{6}^{2}}\]

**Note:**

The required equation can also be calculated by comparing the given terms to the general form of equation of circle that is \[{{x}^{2}}+{{y}^{2}}+2gx+2fy+c\] where the center of circle is given by

(-g.-f) and radius is given as \[r=\sqrt{{{g}^{2}}+{{f}^{2}}-{{c}^{2}}}\].

Calculating the values of g, f and c and substituting back to the general equation we can get the required equation of the circle.

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