Types of Triangles and Their Angles

This video tutorial covers the classification of triangles based on their angles and sides. It begins with an introduction to the concepts of acute, obtuse, and right angles, as well as isosceles, scalene, and equilateral sides. The video then provides six examples, each demonstrating how to classify a triangle using measurements and a protractor. The examples include obtuse isosceles, obtuse scalene, right isosceles, acute isosceles, right scalene, and equilateral triangles. The tutorial concludes with an invitation to continue learning in the next video.

What are the two main criteria for classifying triangles?

• Color and size

• Angles and sides

• Height and base

• Perimeter and area

Which type of triangle has all angles less than 90 degrees?

• Right triangle

• Obtuse triangle

• Acute triangle

• Scalene triangle

What is a characteristic of an obtuse triangle?

• All angles are acute

• One angle is a right angle

• All sides are equal

• One angle is greater than 90 degrees

What is the angle measurement that confirms an obtuse triangle?

• All angles are equal

• Greater than 90 degrees

• Exactly 90 degrees

• Less than 90 degrees

Which type of triangle has one angle exactly 90 degrees?

• Acute triangle

• Scalene triangle

• Right triangle

• Obtuse triangle

Which triangle has two sides of equal length?

• Scalene triangle

• Equilateral triangle

• Isosceles triangle

• Right triangle

What defines a scalene triangle?

• One angle is a right angle

• No sides are equal

• Two sides are equal

• All sides are equal

In Example 1, what type of triangle is formed by the given measurements?

• Obtuse isosceles

• Acute scalene

• Equilateral

• Right isosceles

In Example 1, what is the angle measurement that confirms the triangle type?

• 45 degrees

• 60 degrees

• 140 degrees

• 90 degrees

In Example 2, what type of triangle is identified?

• Right isosceles

• Equilateral

• Obtuse scalene

• Acute scalene