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In an obtuse triangle, one angle is obtuse and the other two are acute. "The buildings are arranged in an obtuse triangle and occupy most of the long, thin parcel of land."
There are several different formulas. The best one to use depends on what information you have about the rest of the triangle.
It depends on what other information you have. If you have the lengths of both the other sides, use Pythagoras. If you have one side and one of the acute angles, use the sine (or cosine) ratio. There are other methods when other bits of information are available.
A scalene triangle normally has three different side lengths and three different acute angles that add up to 180 degrees.
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