Answer:
• you have correctly identified the radius as 157 miles
• 77,398 square miles is the coverage area
Explanation:
The area of a circle is given by the formula ...
A = π·r^2
Filling in your numbers and doing the arithmetic, we get ...
A = 3.14·(157 mi)^2 = 77,397.86 mi^2
The area is approximately 77,398 square miles.