Acute and obtuse triangles

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Notion

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Science and technology

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What Wikipedia says

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.

Excerpt from the Wikipedia article “Acute and obtuse triangles”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: No machine-readable author provided. Syp assumed (based on copyright claims)., Public domain, via Wikimedia Commons.