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[[File:Theta.jpg|thumb]]
[[File:Theta.jpg|frameless]]
==Slope gradient==
==Slope gradient==
Slope gradients are expressed as Y:X where Y is a single unit of rise and X is the corresponding run. It can be calculated by dividing the rise by the run:
Slope gradients are expressed as Y:X where Y is a single unit of rise and X is the corresponding run. It can be calculated by dividing the rise by the run: