ATPL NAV maps and charts.
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A rhumb line?
shortest distance?
No unless it also happens to be a great circle.

The only rhumb lines which are also great circles are ?
Meridians at the equator.

A great circle is the ?
shortest distance between 2 points.

Parallels on a lamberts chart are ?
Arcs of concentric circles nearly equally spaced

On a polar chart parallels are shown as.
concentric circles which are unevenly spaced.

Parallels on a Mercator s chart are ?
straight lines unequally spaced.

Meridians of longitude are represented on a polar stereographic map as
Straight lines radiating from the poles.

Meridians of longitude are represented on a Mercators maps as
Parallel straight lines equally spaced.

Meridians of longitude are represented on a Lambert's conical chart
Straight lines converging at the poles.

Straight lines cross Meridians on a Stereographic map appear as
variable angles

Straight lines cross Meridians on a Mercator's chart 
at a constant angle (rhumb line)

Straight lines cross Meridians on a Lambert's chart
at a variable angle approximately a great circle.

Great circles are represented on a Polar chart as
Approximated straight lines near the pole and concave to the pole near the equator.

Great circle are represented on a Mercator's chart as a
Curved line concave to the equator except the equator and meridians which are straight lines

Great circles on a lambert's chart are represented as
Straight lines concave to the parallels of origin.

Rhumb lines on a polar chart are represented as a 
Curved line concave to the nearer pole.

Rhumb lines on a Mercator's chart are represented as a straight line
Straight line

Rhumb lines on a Lambert's chart are represented as a 
Curved line concave to the nearer pole.