<p>There are three main approaches.
- Fill in the triangles by grading the dirt
- Fill in the triangles with a contrasting fence material (wood or often a stone retaining wall)
- Have the fence follow the slope of the hill - often used with stockade and metal fences or very simple fences that just consist of a few horizontal pieces.</p>
<p>Google images will give you lots of ideas: <a href=“https://www.google.com/search?q=fence+on+a+steep+hill&client=firefox-a&hs=qEi&rls=org.mozilla:en-US:official&source=lnms&tbm=isch&sa=X&ei=eADfUbDMCIfH4APLg4HACw&ved=0CAkQ_AUoAQ&biw=1280&bih=862[/url]”>https://www.google.com/search?q=fence+on+a+steep+hill&client=firefox-a&hs=qEi&rls=org.mozilla:en-US:official&source=lnms&tbm=isch&sa=X&ei=eADfUbDMCIfH4APLg4HACw&ved=0CAkQ_AUoAQ&biw=1280&bih=862</a></p>