So the equation for the area of a circle is [tex]A=3.14(r^2)[/tex]
First to find the radius, you would need to divide the diameter, 26, by half, which in this case its 13.
Replace the r variable with 13 and solve:
[tex]A=3.14(13^2)[/tex]
[tex]A=3.14(169)[/tex]
[tex]A=530.7[/tex]
