Classifying Triangles by Angles

In this video, Mr. J explains how to classify triangles based on their angles. He introduces three types of triangles: acute, obtuse, and right. Acute triangles have all angles less than 90 degrees, obtuse triangles have one angle greater than 90 degrees, and right triangles have one angle equal to 90 degrees. The video includes four examples to illustrate these classifications, helping viewers understand how to identify each type of triangle based on its angles.

What type of triangle has all three angles less than 90 degrees?

• Right triangle

• Acute triangle

• Obtuse triangle

• Equilateral triangle

Tags

CCSS.4.G.A.2

If a triangle has one angle greater than 90 degrees, what type of triangle is it?

• Obtuse triangle

• Acute triangle

• Equilateral triangle

• Right triangle

Tags

CCSS.4.G.A.2

A triangle with angles 40 degrees, 40 degrees, and 100 degrees is classified as?

• Acute triangle

• Right triangle

• Isosceles triangle

• Obtuse triangle

Tags

CCSS.4.G.A.2

What defines a right triangle?

• Two angles greater than 90 degrees

• Three equal angles

• One angle exactly 90 degrees

• All angles less than 90 degrees

Tags

CCSS.4.G.A.2

Which triangle has one angle equal to 90 degrees?

• Right triangle

• Equilateral triangle

• Obtuse triangle

• Acute triangle

Tags

CCSS.4.G.A.2

What is the classification of a triangle with angles 25 degrees, 65 degrees, and 90 degrees?

• Acute triangle

• Isosceles triangle

• Obtuse triangle

• Right triangle

Tags

CCSS.4.G.A.2

Which set of angles would form an acute triangle?

• 60 degrees, 60 degrees, 60 degrees

• 45 degrees, 45 degrees, 90 degrees

• 100 degrees, 40 degrees, 40 degrees

• 30 degrees, 60 degrees, 90 degrees

Tags

CCSS.8.G.A.5

A triangle with one angle measuring 92 degrees is considered?

• Obtuse triangle

• Right triangle

• Acute triangle

• Equilateral triangle

Tags

CCSS.4.G.A.2

Which of the following is NOT a correct way to classify triangles based on their angles?

• Acute triangles

• Obtuse triangles

• Right triangles

• Straight triangles

Tags

CCSS.4.G.A.2

How many types of triangles are classified based on their angles?

• Two

• Three

• Four

• Five

Tags

CCSS.4.G.A.2