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Classify Triangles Standard 4C

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What is a Triangle? A triangle is a polygon with 3 sides. A triangle can be formed from three line segments if and only if the sum of the lengths of any pair is greater than the length of the third segment.

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Acute Triangles Acute triangles are triangles in which all 3 interior angles are less than 90°

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Obtuse Triangles Obtuse triangles are triangles in which 1 interior angle measure is greater than 90°

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**Right triangles have 1 angle that is 90°**

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**Equilateral Triangles**

Equilateral triangles have three sides of equal length and each angle measures 60°

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Isosceles Triangles Isosceles triangles have at least 2 equal sides (an equilateral triangle is a special case of an isosceles triangle)

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**A scalene triangle is a triangle with NO congruent sides**

Scalene Triangles A scalene triangle is a triangle with NO congruent sides

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