Classifying Triangles by Angles and Sides

The video tutorial explains how to classify triangles based on their angles and sides. It covers three types of angle-based classifications: acute, right, and obtuse triangles, and three types of side-based classifications: equilateral, isosceles, and scalene triangles. The tutorial provides examples to illustrate how to identify and name triangles by selecting one classification from each category.

What are the two main criteria for classifying triangles?

• Color and size

• Area and perimeter

• Angles and sides

• Length and width

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

• Obtuse triangle

• Right triangle

• Acute triangle

• Equilateral triangle

Which triangle has one angle exactly 90 degrees?

• Isosceles triangle

• Right triangle

• Acute triangle

• Obtuse triangle

What defines an obtuse triangle?

• All angles are less than 90 degrees

• One angle is exactly 90 degrees

• One angle is greater than 90 degrees

• All angles are equal

What is true about the sides of an equilateral triangle?

• All sides are of different lengths

• Two sides are of equal length

• All sides are of equal length

• No sides are equal

How can you identify an isosceles triangle?

• It has one right angle

• All its sides are equal

• It has no equal sides

• It has two equal sides

What distinguishes a scalene triangle?

• No equal sides

• Three equal angles

• Two sides of equal length

• One angle greater than 90 degrees

How is a triangle classified if it has two equal sides and no angles greater than 90 degrees?

• Right equilateral

• Acute scalene

• Obtuse scalene

• Acute isosceles

What classification fits a triangle with three different sides and one angle greater than 90 degrees?

• Acute scalene

• Equilateral obtuse

• Obtuse scalene

• Right isosceles

Which classification applies to a triangle with a right angle and three different side lengths?

• Right equilateral

• Acute equilateral

• Obtuse isosceles

• Right scalene