Chapter 1 - Tools of Geometry - 1-8 Perimeter, Circumference, and Area - Practice and Problem-Solving Exercises - Page 65: 29

$452.2\ cm^2$

To find the area of a circle, we use the formula $A=\pi r^2$ $\pi$ is approximately 3.14. The radius (r) is half the diameter(d), so the radius given is 12 cm. Plug the given radius and approximate value of $\pi$ into the formula and simplify: $A=\pi r^2=3.14\times12^2=3.14\times144=452.2$