Discussion
While teaching in a Social Science class, a student asks you - 'how can we measure the distance between longitudes on Equator ?' What answer will be correct for such calculation ?
Answer: C
The correct method is dividing the total length of the Equator by 360.
There are 360 degrees of longitude around the earth, 180 east and 180 west of the Prime Meridian, and the meridians are drawn at one-degree intervals. At the Equator they are therefore spaced equally around a full circle, so the distance between two neighbouring meridians is the Equator's length divided by 360.
\[ \begin{aligned} d &= \frac{40{,}075\ \text{km}}{360} \\ &\approx 111\ \text{km} \end{aligned} \]
Dividing by 180 counts only one hemisphere's meridians and doubles the answer to about 222 km. Dividing double the length by 90 gives eight times the true figure, and dividing half the length by 360 gives half of it.
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