Triangle Classification and Properties

This video tutorial explains the different types of triangles and how they can be classified. Triangles can be categorized based on the length of their sides or the measure of their angles. Equilateral triangles have all sides equal, isosceles triangles have two equal sides, and scalene triangles have no equal sides. When classified by angles, triangles can be right-angled, acute-angled, or obtuse-angled. The video also highlights the etymology of these terms to aid in understanding and remembering them.

What are the two main ways to classify triangles?

• By the number of vertices and edges

• By the type of material they are made of

• By the length of their sides and their angles

• By the color and size

What is the name of a triangle with all three sides of equal length?

• Scalene

• Isosceles

• Right

• Equilateral

Which type of triangle has two sides of equal length and one side of different length?

• Scalene

• Isosceles

• Equilateral

• Right

What is the term for a triangle with no sides of equal length?

• Right

• Equilateral

• Isosceles

• Scalene

What is the defining feature of a right triangle?

• It has one angle greater than 90 degrees

• It has all sides of equal length

• It has one angle of 90 degrees

• It has three equal angles

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

• Right

• Obtuse

• Acute

• Scalene

What is the characteristic of an obtuse triangle?

• It has one angle of 90 degrees

• It has one angle greater than 90 degrees

• It has all angles less than 90 degrees

• It has all sides of equal length

What is recommended at the end of the video?

• To practice drawing triangles

• To watch more videos

• To subscribe to the YouTube channel

• To read more books