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en.wikipedia.org/wiki/Acute_and_obtuse_triangles

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mathworld.wolfram.com/AcuteTriangle.html

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www.dictionary.com/browse/acute-angle

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www.merriam-webster.com/dictionary/acute

2 : ending in a sharp point: as a : being or forming an angle measuring less than
90 degrees <an acute angle> b : composed of acute angles <an

www.coolmath.com/reference/triangles-types

Answer

acute triangle | Define acute triangle at Dictionary.com

dictionary.reference.com/browse/acute triangle

dictionary.reference.com/browse/acute triangle

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www.virtualnerd.com

Knowing how to identify these triangles is an important part of solving many ...

study.com

In this lesson, you'll find out what makes a triangle an

math.tutorvista.com

Triangles can be classified by their sides and angles. An