A Large Region of Forest Has Been Infested with Gypsy

Multiple Choice

A large region of forest has been infested with gypsy moths.The region is roughly triangular, as shown in the figure on the next page.From the northernmost vertex A of the region, the distances to the other vertices are x = 25 miles south and 10 miles east (for vertex B) , and 20 miles south and 28 miles east (for vertex C) .Use a graphing utility to approximate the number of square miles in this region. ​ ​

A) 250 mi²
B) 280 mi²
C) 260 mi²
D) 290 mi²
E) 270 mi²