Classifying Triangles: Side Lengths and Angles

This video tutorial covers the fifth-grade concept of classifying triangles. It explains two primary methods of classification: by side length and by angle measure. The video details the characteristics of scalene, isosceles, and equilateral triangles, as well as right, acute, and obtuse triangles. Examples and visual aids are used to illustrate these concepts, helping students understand how to identify and differentiate between various types of triangles based on their attributes.

What are the two main ways to classify triangles?

• By size and perimeter

• By side length and angle measure

• By area and height

• By color and shape

Tags

CCSS.4.G.A.2

What type of triangle has no equal sides?

• Acute

• Scalene

• Isosceles

• Equilateral

Tags

CCSS.4.G.A.2

Which triangle has at least two equal sides?

• Obtuse

• Isosceles

• Equilateral

• Scalene

Tags

CCSS.4.G.A.2

What is a triangle with all three sides equal called?

• Equilateral

• Scalene

• Isosceles

• Right

Tags

CCSS.4.G.A.2

What is the special name given to a triangle with all sides equal?

• Uniform

• Symmetrical

• Equilateral

• Regular

Tags

CCSS.4.G.A.2

Which triangle can also fit into another classification by side length?

• Equilateral

• Right

• Scalene

• Isosceles

Tags

CCSS.4.G.A.2

What type of triangle has a 90-degree angle?

• Acute

• Obtuse

• Right

• Equilateral

Tags

CCSS.4.G.A.2

A triangle with all angles less than 90 degrees is called?

• Obtuse

• Isosceles

• Acute

• Right

Tags

CCSS.4.G.A.2

Can a triangle have more than one 90-degree angle?

• Yes, but only in special cases

• No, it becomes a quadrilateral

• No, it remains a triangle

• Yes, always

Tags

CCSS.4.G.A.2

What do you call a triangle with one angle greater than 90 degrees?

• Acute

• Equilateral

• Obtuse

• Right

Tags

CCSS.4.G.A.2