Physics
posted by Martha .
Assuming that the Earth is spherical and recalling that latitudes range from 0° at the Equator to 90° N at the North Pole, how far apart, measured on the Earth's surface, are Copenhagen (55.67° N latitude), and Rome (41.90° N latitude)? The two cities lie on approximately the same longitude. Do not neglect the curvature of the Earth in determining this distance.
The answer is supposed to be 1.53e+06 m. How do I find this answer?

Convert the latitude difference of the two cities from degrees to radians. Then multiply that angle by the radius of the Earth.
Arc length = radius * (angle in radians)