Classifying Triangles and Angles

The video tutorial covers the classification of triangles by their angles and side lengths. It begins with a review of angle types, including right, obtuse, and acute angles. The tutorial then explains how triangles can be classified as acute, right, or obtuse based on their angles. It also covers classification by side lengths, introducing equilateral, isosceles, and scalene triangles. The video includes examples and practice exercises to reinforce learning, and concludes with a reminder to prepare for a quiz using the textbook.

What is the main topic of math lesson 36?

• Classifying circles

• Classifying triangles

• Classifying polygons

• Classifying quadrilaterals

What is a right angle?

• An angle equal to 180°

• An angle equal to 90°

• An angle less than 90°

• An angle greater than 90°

Which angle is larger than 90°?

• Straight angle

• Acute angle

• Right angle

• Obtuse angle

How many acute angles does every triangle have at least?

• None

• One

• Two

• Three

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

• Scalene triangle

• Acute triangle

• Obtuse triangle

• Right triangle

How can triangles be classified by their sides?

• By their side lengths

• By their color

• By their area

• By their angles

What is an equilateral triangle?

• A triangle with all sides of equal length

• A triangle with all sides of different lengths

• A triangle with one right angle

• A triangle with two sides of equal length

Which triangle has no equal sides?

• Isosceles triangle

• Scalene triangle

• Equilateral triangle

• Right triangle

What is the name of a triangle with two equal sides?

• Obtuse triangle

• Scalene triangle

• Equilateral triangle

• Isosceles triangle

What type of triangle is formed if it has one angle greater than 90°?

• Acute triangle

• Right triangle

• Equilateral triangle

• Obtuse triangle