#acute_and_obtuse_triangles
Acute and obtuse triangles
Triangles without a right angle
An acute triangle is a triangle with three acute angles. An obtuse triangle is a triangle with one obtuse angle and two acute angles. Since a triangle's angles must sum to 180° in Euclidean geometry, no Euclidean triangle can have more than one obtuse angle.
Tue 10th
Provided by Wikipedia
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