Classifying Triangles by Angles and Sides

This video tutorial explains how to classify triangles by their angles and sides. It begins with a review of triangle basics, including vertices, sides, and angles. The tutorial then covers how to classify triangles by angles, such as acute, obtuse, right, and equiangular triangles. It also explains how to classify triangles by sides, including equilateral, isosceles, and scalene triangles.

What defines a triangle?

• A circle divided into three parts

• A three-sided polygon

• A shape with four sides

• A square with one side missing

What is the correct way to label a triangle's vertices?

• Using numbers

• Using consecutive letters

• Using the same letter for all vertices

• Using special symbols

What are the endpoints of a triangle's side called?

• Endpoints

• Angles

• Line segments

• Vertices

How can you name an angle in a triangle?

• Using one letter

• Using two letters

• Using three letters with the vertex in the middle

• Both A and C are correct

What type of triangle has one angle more than 90 degrees?

• Acute triangle

• Obtuse triangle

• Equiangular triangle

• Right triangle

A triangle with all angles measuring 60 degrees is called?

• Equiangular triangle

• Right triangle

• Obtuse triangle

• Acute triangle

Which triangle has sides of all the same length?

• Equilateral triangle

• Isosceles triangle

• Acute triangle

• Scalene triangle

Which statement is true about an equilateral triangle?

• It has one right angle

• All sides are of equal length

• It has two equal sides

• It has no equal sides

What type of triangle has two sides of equal length?

• Isosceles triangle

• Right triangle

• Scalene triangle

• Equilateral triangle

A triangle with all sides of different lengths is called?

• Acute triangle

• Scalene triangle

• Isosceles triangle

• Equilateral triangle