obtuse triangle

[äb′tüs ′trī‚aŋ·gəl]

(mathematics)

A triangle having one obtuse angle.

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References in periodicals archive ?

Emma added that she would be sure to use acute and obtuse triangles.

This concept applies to all possible and actual triangles--red ones and green ones, right and obtuse triangles, isosceles and scalene triangles.

Similarly, prompt students to find isosceles obtuse triangles with the shorter side of length 1, 2, 3, and 4 units.