That's true of the Mercator projection, among others.
Two straight lines that remain equal distance apart are parallel lines.
It will roll around. To make a flat map from a round globe, a projection is used. In making the projection not all measures can be preserved and so distances will be stretched for some areas, and straight lines on the projection will correspond to curved lines on the globe. There are different projections that can be used which try to minimise the effect on different measures.
A polygon.
an intersection
the mercator projection lines are straight but the robinsons are curved
The ability of the Mercator projection to allow straight and constant course lines. Or longitude and latitude lines.
The Mercator projection does that.
cylindrical
The Mercator projection preserves straight lines, making it useful for navigation. It also shows true direction, making it valuable for sailors and pilots. Additionally, it accurately represents shapes and angles near the equator.
On a Mercator projection, meridians appear as straight, parallel lines running from top to bottom of the map, spaced evenly apart. This is because the Mercator projection is a cylindrical map projection that preserves straight lines of constant bearing, resulting in meridians being stretched vertically towards the poles.
That's true of the Mercator projection, among others.
Lines of longitude on the Mercator projection are straight and evenly spaced, while on the other two projections (such as the Robinson or Winkel Tripel), they are curved and vary in spacing. This distortion in longitude is a trade-off for maintaining accurate shapes and angles on the Mercator projection.
Gerardus Mercator developed the Mercator projection in the 16th century, which is a cylindrical map projection that preserves straight lines. This projection became popular for navigation due to its ability to show lines of constant course as straight lines on the map. While it distorts the size of objects away from the equator, it is still widely used for world maps.
The most famous example of cylindrical projection is the Mercator projection. This type of map projection distorts the size and shape of landmasses as they get closer to the poles, but it is commonly used for nautical navigation due to its ability to represent lines of constant compass bearing as straight lines.
The Mercator projection has straight meridians and parallels that intersect at right angles. Scale is true at the equator or at two standard parallels equidistant from the equator. The projection is often used for marine navigation because all straight lines on the map are lines of constant azimuth.
A projection with parallel latitude lines and parallel longitude lines is known as a cylindrical projection. This type of projection preserves the shape of features along the equator and distorts them towards the poles. Examples include the Mercator and Miller cylindrical projections.