A rancher has 300 feet of fencing to enclose a pasture bordered on one side by a river. the river side of the pasture needs no f
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Here's a diagram showing how to combine angles LDA (in red) and angle ADE (in blue). Hopefully it becomes a bit clearer why these two angles add up to line segment LE. Erase the shared segment DA if it helps show LE better.
See attached image below.
