Classifying Triangles

Classify using angle measurements.

Groups:

(a) Right

,

(b) Obtuse

,

(c) Acute

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Tags

CCSS.4.G.A.2

Classify by using side lengths.

Groups:

(a) Equilateral

,

(b) Isosceles

,

(c) Scalene

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Tags

CCSS.4.G.A.2

Match the following definitions to the correct vocabulary term.

• A triangle that has all congruent sides.

• Equilateral Triangle

• A triangle that has no equal sides.

• Scalene Triangle

• A triangle with only 2 congruent sides.

• Isosceles Triangle

Tags

CCSS.4.G.A.2

The triangles have been classified by a shared attribute (side length or angle type). Use one of the words acute, right, obtuse, scalene, isosceles, or equilateral to label the headings to identify the way the triangles have been sorted.

c

b

d

Equilateral

Right

Acute

Isosceles

Scalene

Obtuse

Tags

CCSS.4.G.A.2

Tags

CCSS.4.G.A.3

If the perimeter of an equilateral triangle is 15 cm, what is the length of each side?

Mathematical Equivalence

ON

Tags

CCSS.3.MD.D.8

Identify each triangle according to side length.

• Scalene

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• Isosceles

• 
• Equilateral

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Tags

CCSS.4.G.A.2

A student used this graphic organizer to classify different figures.

Which figures belong in the part of the organizer labeled "Isosceles triangles"?

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Tags

CCSS.2.G.A.1

Triangles can be classified in 2 ways:

By their angles: acute, right, or obtuse

By their sides: equilateral, isosceles, scalene

Select all the ways the triangle can be classified.

• Acute

• Scalene

• Obtuse

• Equilateral

• Isosceles

Tags

CCSS.4.G.A.2

Tags

CCSS.6.NS.C.6C