Which of the following lines (of latitude or longitude) would represent by 180 longitude?

South Pole

Equator

Prime meridian

North Pole

International date line

International date line would represent by 180 longitude

Explanation:

An "imaginary line of demarcation" on the earth's surface that runs from the south pole to the north pole. It demarcates the one-day calendar change to the next. Through the centre of the pacific ocean, it passes with 180-degree longitude and halfway through the world from the Greenwich meridian.

Though in many cases the imaginary line of demarcation follows 180-degree meridian exactly. And at other places, the imaginary line of demarcation deviates east or west through the apex.