The source of the River Shannon is the Shannon Pot in County Cavan.
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If you're talking about slope, it is rise over run. But why is it not the other way run over rise?
The slope can be remembered as "rise over run". When the slope is an integer, it means that the rise over run is positive.
We use words RUN and RISE to describe the two legs of the right triangle. The RUN is the length of the horizontal leg, and the RISE is the length of the vertical leg. We assign a positive sign to the rise if it goes down to meet the graphed line.
The rise is calculated as the horizontal run distance times the tangent of the angle (tan angle = rise/run). Since tan 1 degree is 0.0175 the rise is 100 x .0175 = 1.75 feet
Rise is the vertical distance between the two points on the graph. This is measured using the Y axis.