Calculating Distance Between Copenhagen and Rome on Same Longitude

[perfectlovehe]

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.
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[JaredJames]

Please use the correct formatting and show your attempt at this question as per PF guidelines.

Jared