hi! id like to verify if my answer in this equation is correct

Every year, the Philippines gets hit by approximately 20 typhoons. Accurate forecast is therefore needed for the people to be ready when the typhoon strikes. Suppose typhoon X is in the country and is predicted to have a BSD-km radius. Further, it was reported that town A located 260 km south and 255 km west from its eye is at the periphery or circumference of the typhoon. The townsfolk want to verify this news. ' i T' n