Set the points out along one straight line then one line will do the trick.
Contour lines connect points with the same elevation or altitude. These lines are used on maps to help visualize the shape and elevation of the terrain.
depends on the position of the points if points are collinear, we have just only one line, the minimum number. If points are in different position (if any of the two points are not collinear) we have 21 lines (7C2), the maximum number of lines.
On a Weather Map, the lines connecting points of equal temperature are called Isotherms.Similarly, the lines that connect points of equal barometric pressure are called Isobars.
Contour lines connect points of equal elevation while isobars connect points of equal pressure
Contour lines connect points with the same elevation or value, showing the shape and elevation of the land on a map.
Contour lines
The lines connect points that are at the same elevation.
Both isobars as contour lines connect points on a map along which values of a given parameter are equal. Contour lines connect points of equal elevation while isobars connect points of equal pressure.
n - 1
On a weather map, the lines that connect points with equal barometric pressure are called Isobars.Iso = equalbar = pressure
four
lines on a map joining points of equal atmospheric pressure