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The angle of elevation is looking at an object above your line of sight.
When a V-shaped contour line points downhill, it means that the contour line is under very low elevation. And incase your wondering about when the contour line is uphill, it means that the elevation level is very high.
Hidden edges
Contour lines are used when you have spatial data, with the x,y values identifying a particular point and z is the value at that point. It could be elevation above sea level, temperature, pressure or any other measurable property. Contour lines identify where the data suggests equal values should exist. On an elevation map, contour lines show the elevation of equal values points. A 50 ft contour line would go through all points where the data suggest should be at 50 ft elevation. See related links.
Slope is expressed as the percentage of rise/fall in elevation over a specific distance and is determined by dividing the change in elevation by the length of the line. So if a line segment is 10 feet long and rises or falls 1 foot in elevation, the slope would be 1 ft/10 ft or 10 percent.