Read the para 'Contour Lines of page 5 and comment on it.
A Contour line of a function of two variables is a curve along which the function has a constant value.In
cartography a Contour line joins points of equal elevation above a given level such as mean sea level.
Contour lines are carved, straight or a mixture of both lines on a map describing intersection of
a real surface with one or more horizontal plains.
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real surface
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