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Acute and obtuse triangles

An acute triangle (or acute-angled triangle) is a triangle with three acute angles (less than 90°). An obtuse triangle (or obtuse-angled triangle) is a triangle with one obtuse angle (greater than 90°) 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.

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Acute and obtuse triangles

Nodes45
Edges44
Triples0
Avg. degree1.96
Density0.044444
Components1

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triangle acute obtuse displaystyle sides triangles angles side inequality one two three angle opposite area circumradius tan frac reverse triangle's

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