How many degrees is one half of a circle?
A circle is 360 degrees, so half that is 180.
Because latitude runs from the equator to one or the other of the poles, 90 degrees. That's one-fourth of a full circle around the globe. Longitude starts at Greenwich, England and runs, to the west or to the east, to the International Date Line (in the Pacific Ocean), 180 degrees. That's one-half of a full circle around the globe.
For a circle, 2 pi r is the circumference of a circle. If you imagine yourself standing at the center of a circular race track, to follow a car going around the track once, you would have to rotate 360 degrees, which in radians is expressed as 2pi. Radians is basically another measure for degrees based on the circumference of a circle. since 180 degrees is one half of a full rotation on half of…
There is no single meridian of longitude that divides the earth in half. Each meridian is a semi-circle drawn between the north and south poles. However, if you take any meridian and join it to the one marking the longitude exactly 180 degrees away from the first one, then together they form a circle that divides the surface of the earth in half.