Classifying Triangles

Classify using angle measurements.

Groups:

(a) Right

,

(b) Obtuse

,

(c) Acute

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Tags

TEKS.MATH.4.6C

Classify by using side lengths.

Groups:

(a) Equilateral

,

(b) Isosceles

,

(c) Scalene

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Tags

TEKS.MATH.4.6C

Match the following definitions to the correct vocabulary term.

• A triangle with only 2 congruent sides.

• Scalene Triangle

• A triangle that has no equal sides.

• Equilateral Triangle

• A triangle that has all congruent sides.

• Isosceles Triangle

Tags

TEKS.MATH.4.6C

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

Scalene

Isosceles

Obtuse

Tags

TEKS.MATH.4.6C

Tags

TEKS.MATH.4.6B

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

Mathematical Equivalence

ON

Identify each triangle according to side length.

• Equilateral

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• Isosceles

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• Scalene

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Tags

TEKS.MATH.4.6C

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

TEKS.MATH.1.6D

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

TEKS.MATH.4.6C

Tags

TEKS.MATH.6.2C