Take into account that the area of a circle is given by:
[tex]A=\pi r^2[/tex]
where,
r: radius = 7.8cm
π = 3.14
Replace the previous values of the parameters and simplify:
[tex]A=(3.14)(7.8cm)^2\approx191.13cm^2^{}[/tex]
Hence, the area of the circle is approximately 191.13cm^2
