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# 6.6: Understanding the Angle Measures of Triangles

Difficulty Level: At Grade Created by: CK-12
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Practice Triangle Sum Theorem

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Estimated6 minsto complete
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Estimated6 minsto complete
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### Vocabulary Language: English

Acute Triangle

An acute triangle has three angles that each measure less than 90 degrees.

Congruent

Congruent figures are identical in size, shape and measure.

Equilateral Triangle

An equilateral triangle is a triangle in which all three sides are the same length.

Isosceles Triangle

An isosceles triangle is a triangle in which exactly two sides are the same length.

Obtuse Triangle

An obtuse triangle is a triangle with one angle that is greater than 90 degrees.

Right Triangle

A right triangle is a triangle with one 90 degree angle.

Scalene Triangle

A scalene triangle is a triangle in which all three sides are different lengths.

Triangle Sum Theorem

The Triangle Sum Theorem states that the three interior angles of any triangle add up to 180 degrees.

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