precise but indiscriminate

What is the injury-producing impact of a 500 lb smart bomb, in square feet? Imagine a circle with a four hundred foot radius. Use πr2 and get 502,654.825. Google Calculator: pi * 400^2

If the room in which you sit is 20 * 20 (400 sq ft), the affected area would encompass 1,256 similarly-sized rooms. The likelihood of collateral damage seems high.