SOLUTION: how you measure a slope of hill by having the countor lines only on map?

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Question 245405: how you measure a slope of hill by having the countor lines only on map?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
how you measure a slope of hill by having the countor lines only on map?
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The contour lines show the change in elevation.
The hourizontal distance is determined by using the scale of the map.
The slope is the vertical change divided by the horizontal change.
The angle is the arc tangent of the slope.