precal question

Question

St Louis, Missouri, and New Orleans, Louisiana, lie approximately on the same meridian. St Louis has a latitude of 39° N, and New Orleans has a latitude of 30° N. Find the distance between these two cities. (The radius of the earth is 3960 mi. Round your answer to the nearest whole number)

Answer 1

9/360 * circumference =

9/360 * 2 * pi * radius =

9/360 * 2 * pi * 3960 = 622

Google maps says 677 miles via Interstate 55,

but that is not a straight path as it goes around

the Mark Twain forest. It's then a pretty straight

forward path down I-55 from Jackson,MS