Obtuse angle lies between 90° and 180° and look like a reclined chair.
Obtuse Angle: What is it, Degrees, Examples & More
Solved The smaller two sides of an obtuse triangle are known
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Obtuse Angle: Definition, Types & Examples
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Obtuse Angle: Definition, Types & Examples
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geometry - When classifying triangles as obtuse, acute, or right by checking $c^2>a^2+b^2$, $c^2 What are triangles and how are they classified? - The Handy Math Answer Book