## Basic College Mathematics (9th Edition)

Total area effected by the earthquake: 2,543,400 km$^{2}$
We will treat the distance that the earthquake was felt as the radius since it was in all directions. Area of a Circle: $A$ = $\pi$$r$$^{2}$ Therefore: $A$ = (3.14)(900 km)$^{2}$ $A$ = 2,543,400 km$^{2}$