Classifying Triangles

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Classifying Triangles

• Joe Griggs

Subject Geometry Grade Level 7th grade
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Two Ways to Classify Triangles

• By Their Sides
• By Their Angles

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Classifying Triangles By Their Sides

• Scalene
• Isosceles
• Equilateral

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Scalene Triangles

• No sides are the same length

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Isosceles Triangles

• At least two sides are the same length

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Equilateral Triangles

• all sides are the same length

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Classifying Triangles By Their Angles

• Acute
• Right
• Obtuse

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Acute Triangles

• Acute triangles have three acute angles

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Right Triangles

• Right triangles have one right angle

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Obtuse Triangles

• Obtuse triangles have one obtuse angle

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Classify this triangle.
Right Scalene
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Classify this triangle.
Obtuse Isosceles
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Classify this triangle.
Acute Scalene
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Classify this triangle.
Acute Isosceles
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Classify this triangle.
Obtuse Scalene
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Classify this triangle.
Right Isosceles
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Triangle Degrees

• The sum of the measures of any triangle is 180.

x
What is the measure of x?
60
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